Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
tru nang » tra nang, tri nang, truc nano
va hanh » van hanh, va thanh, va danh
cao suc » cao su, cao duc
cao tuc » dao tuc, cao duc, cao toc
te sach » toc sach
hieu va » lieu va, hieu qua
tu nang » tu nong, 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 (tru nang)) xa hoi. hieu va ((cao tuc) OR (cao suc)) va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tru nang)) xa hoi. hieu va ((cao tuc) OR (cao suc)) va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) or (tru nang)) xa hoi. hieu va ((cao tuc) OR (cao suc)) va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tru nang)) xa hoi. hieu va ((cao tuc) OR (cao suc)) va hanh dai cua triet*.