Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
van cam » van nam, van lam, van cau
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ty ((nang xa) or (lang xa)) hoi. hieu van cam xuc ((ban hanh) OR (ban hang)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. hieu van cam xuc ((ban hanh) OR (ban hang)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (lang xa)) hoi. hieu van cam xuc ((ban hanh) OR (ban hang)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (lang xa)) hoi. hieu van cam xuc ((ban hanh) OR (ban hang)) di cua tre*.