Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
te sach » toc sach
tu hang » tu hanh, tu hung, ty hang
van cam » van nam, van lam, van cau
tai cau » tai cac, tai cao
xuc va » tuc va, luc va, xac va

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 hang) OR (thu hang)) xa hoi. hieu van cam ((xuc va) or (duc va)) doanh tai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu hang) OR (thu hang)) xa hoi. hieu van cam ((xuc va) OR (duc va)) doanh tai cau triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu hang) OR (thu hang)) xa hoi. hieu van cam ((xuc va) or (duc va)) doanh tai cau triet*".