Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
cac thuc » cach thuc, cac thu, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach v nang mai hoi. hieu ve cac thuc dan hanh ((vi cua) or (vai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang mai hoi. hieu ve cac thuc dan hanh ((vi cua) OR (vai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sach v nang mai hoi. hieu ve cac thuc dan hanh ((vi cua) or (vai cua)) viet*.