Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh doi » thanh loi, thanh moi, thanh do
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
doi cua » dai cua, hoi cua
cac xuc » cam xuc, chat xuc, cac cuoc
te sach » toc sach
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang

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 ((tu nang) OR (tu nong)) xa hoi. hieu qua ((cac xuc) or (cac nuoc)) gia thanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nong)) xa hoi. hieu qua ((cac xuc) OR (cac nuoc)) gia thanh doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nong)) xa hoi. hieu qua ((cac xuc) or (cac nuoc)) gia thanh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nong)) xa hoi. hieu qua ((cac xuc) or (cac nuoc)) gia thanh doi cua triet*.