Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
te sach » toc sach
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
tuc cua » thuc cua, tac cua, luc cua
cua dan » cua dang, cua ban, ca dan
ve cam » ve cham, ve cac, va cam
ca cau » cua cau, cac cau, can 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: ((su sach) OR (te sach)) ky nang cau hoi. hieu ve cam tuc cua dan ca cau tren~.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang cau hoi. hieu ve cam tuc cua dan ca cau tren*.