Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
cham dua » chay dua, cham giua, pham duc
ban hang » ngan hang
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dua ban » dia ban, cua ban, qua ban
hai cuc » hai cua, thai cua, hai huoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang mai hoi. hieu ve cham dua ban hang ((hai cuc) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang mai hoi. hieu ve cham dua ban hang ((hai cuc) OR (tai cuc)) tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang mai hoi. hieu ve cham dua ban hang ((hai cuc) or (tai cuc)) tre*.