Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
tu nong » tu dong, tu cong, tu tong
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va hanh » van hanh, va thanh, va danh
tu nang » tru nang, tu nano, tu lang
tuc va » thuc va, truc va, tuc xa
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: toc sach ((tu nang) or (tu nong)) xa hoi. hieu va cao tuc va hanh dai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (tu nong)) xa hoi. hieu va cao tuc va hanh dai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu nang) or (tu nong)) xa hoi. hieu va cao tuc va hanh dai ((cua triet) or (va triet))*.