Perhaps you should try some spelling variations:
ban hang » ngan hang
qua cham » qua hai, qua cac, va cham
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
vu kham » vu khanh
sach tu » sach thu, cach tu, sach ty
xang xa » lang xa, mang xa, ang xa
tu xang » ty xang, tu lang, tu quang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu xang xa hoi. hieu ((qua cham) or (vu kham)) soc ((van hanh) or (ban hang)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu xang xa hoi. hieu ((qua cham) OR (vu kham)) soc ((van hanh) OR (ban hang)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu xang xa hoi. hieu ((qua cham) or (vu kham)) soc ((van hanh) or (ban hang)) vi cua tre*.