Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
vi dau » vi dai, va dau, bi dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) co hoc. hieu ve cac tuc va danh vi dau tren~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) co hoc. hieu ve cac tuc va danh vi dau tren*.