Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cay » van cau, van bay, van ca
cay qua » cau qua, cac qua, cay lua
qua ban » cua ban, qua quan
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu van cay qua ban thanh toan ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu van cay qua ban thanh toan ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu van cay qua ban thanh toan ((cua tre) or (cau tren))*.