Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
lam duc » lam duoc, pham duc, nam duoc
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky lang) OR (ky dang)) xa hoi. hieu van lam duc ban thanh van ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky dang)) xa hoi. hieu van lam duc ban thanh van ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky dang)) xa hoi. hieu van lam duc ban thanh van ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky dang)) xa hoi. hieu van lam duc ban thanh van ((cua tre) or (cua triet))*.