Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, dua tren
hanh di » hanh vi, hanh de, hang di
luc ban » duc ban, cuc ban, luc bat
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (tu sach)) ky tang xa hoi. hieu van cau luc ban hanh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (tu sach)) ky tang xa hoi. hieu van cau luc ban hanh di ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (tu sach)) ky tang xa hoi. hieu van cau luc ban hanh di ((cua tre) OR (cua triet))*".