Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
sach thu » sach thue, sach thieu, sach tham
thuc dan » thuc hanh, hoc dan, thuc vat
thuc van » thuc vat, thuc va, thuc hanh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach thu)) nang xa hoi. hieu va cao ((thuc van) OR (thuc dan)) hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang xa hoi. hieu va cao ((thuc van) OR (thuc dan)) hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) nang xa hoi. hieu va cao ((thuc van) OR (thuc dan)) hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) nang xa hoi. hieu va cao ((thuc van) OR (thuc dan)) hanh dai cua triet*.