Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
thuc day » thuc dan, thuc vat
va triet » va thiet, va trien, ve triet
hanh va » hang va, hanh vi
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
ve nam » he nam, va nam, le nam

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 ly nang cao hoi. hieu ve nam ((thuc va) OR (thuc day)) hanh va ((va triet) or (va thieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang cao hoi. hieu ve nam ((thuc va) OR (thuc day)) hanh va ((va triet) OR (va thieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang cao hoi. hieu ve nam ((thuc va) OR (thuc day)) hanh va ((va triet) or (va thieu))".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang cao hoi. hieu ve nam ((thuc va) OR (thuc day)) hanh va ((va triet) or (va thieu))*.