Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
cua triet » cua viet, su triet, va triet
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
lam duc » lam duoc, pham duc, nam duoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
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) OR (sach y)) nang xa hoi. hieu van lam duc ban thanh toan ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duc ban thanh toan ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duc ban thanh toan ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duc ban thanh toan ((cua tre) or (cua triet))*.