Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
tang cac » bang cac, hang cac, tang ca
cac khoi » cac thoi, cac khoan, cach thoi
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » van thanh, tuan anh, van minh
tu sach » thu sach, su sach, tu cach
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
buu tre » cuu tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky tang cac khoi. hieu va cac xuc ((van hanh) OR (van anh)) tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang cac khoi. hieu va cac xuc ((van hanh) OR (van anh)) tai buu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang cac khoi. hieu va cac xuc ((van hanh) OR (van anh)) tai buu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang cac khoi. hieu va cac xuc ((van hanh) OR (van anh)) tai buu tre*.