Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
hanh vai » hanh vi, hanh va, hanh tai
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
sach ky » sac ky, sach y, sach ty
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay
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 nang ma hoi. hieu va nam ((thuc va) or (thuc dan)) hanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu va nam ((thuc va) OR (thuc dan)) hanh vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu va nam ((thuc va) or (thuc dan)) hanh vai ((va triet) or (va thiet))*.