Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuat bai » thuat bao, thuyet bai, thuat xay
thanh hai » thanh phan, thanh hoa, thanh san
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
hai cau » hai chau, hai chu, hai hau
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam

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) or (thuat bai)) ky nang ma hoi. hieu ve nam thuc ban thanh hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat bai)) ky nang ma hoi. hieu ve nam thuc ban thanh hai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat bai)) ky nang ma hoi. hieu ve nam thuc ban thanh hai cau tren*.