Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
ty nang » ky nang, ty xang, ty hang
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
cau dua » cau qua, cau cua, ca dua
dua ban » dia ban, cua ban, qua ban
pho cuc » pho cu, cho cuoc, pham cuc
cuc tre » duc tre, cua tre, cuu tre

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) or (doc sach)) ty nang mai hoi. hieu van cau dua ban thanh pho cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang mai hoi. hieu van cau dua ban thanh pho cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ty nang mai hoi. hieu van cau dua ban thanh pho cuc tre*.