Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
xa hanh » xa thanh, xa khanh, va hanh
cao suc » cao su
cao duc » dao duc, giao duc, tao duoc
te sach » toc sach
hieu va » lieu va, hieu qua
tu nong » tu cong, tu tong, tu tuong

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 nong) OR (tu dong)) xa hoi. hieu va ((cao duc) or (cao suc)) xa hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nong) OR (tu dong)) xa hoi. hieu va ((cao duc) OR (cao suc)) xa hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nong) OR (tu dong)) xa hoi. hieu va ((cao duc) or (cao suc)) xa hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nong) OR (tu dong)) xa hoi. hieu va ((cao duc) or (cao suc)) xa hanh dai cua triet*.