Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
ba tren » la tren, ca tren, xa tren
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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 y nang mai hoi. hieu va cam tuc ((ban thanh) or (gia thanh)) hai ba tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang mai hoi. hieu va cam tuc ((ban thanh) OR (gia thanh)) hai ba tren.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang mai hoi. hieu va cam tuc ((ban thanh) or (gia thanh)) hai ba tren*.