Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac vung » cac chung, cach dung, cac tuong
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
cac ung » cac chung, cac cong, cac dang
cua cau » cua cac, cua chu, cua cay
cac vuc » cac nuoc, cac cuoc, cac quoc
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
tu nang » tru nang, tu nong, tu nano
vi cua » vai cua, di cua

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 tu nang cao hoc. hieu ve ((cac vuc) OR (((cac vung) OR (cac ung)))) van hanh vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang cao hoc. hieu ve ((cac vuc) or (((cac vung) OR (cac ung)))) van hanh vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang cao hoc. hieu ve ((cac vuc) or (((cac vung) OR (cac ung)))) van hanh vi cua cau*.