Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
ve cam » ve cham, ve cac, va cam
vi cau » va cau, ve cau, di cau

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: ((te sach) OR (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sanh)) ky nang xa hoi. hieu ve cam thuc va hang vi cau tren*.