Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va trien, ve triet, va viet
hanh lai » hanh lam, hanh tai, thanh lap
nam thuc » nam thuoc, am thuc, nam thu
hang hoa » hang khoa, thanh hoa, hang va
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu he » hieu ve, hiem he, hieu le
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ky hang » ky nang, ly hang, ky dang
su sach » so sach, vu sach
he nam » ha nam, nghe nam
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky hang hoa hoi. hieu he nam thuc va hanh lai ((cua triet) or (((va triet) OR (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky hang hoa hoi. hieu he nam thuc va hanh lai ((cua triet) OR (((va triet) OR (va thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky hang hoa hoi. hieu he nam thuc va hanh lai ((cua triet) or (((va triet) OR (va thiet))))".
• Adding a wildcard symbol may retrieve word variants: su sach ky hang hoa hoi. hieu he nam thuc va hanh lai ((cua triet) or (((va triet) OR (va thiet))))*.