Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau

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

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