Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
ly nang » ky nang, ly hang, ly vang
qua dau » qua da, qua bau, qua dan
dau xuc » dau xac, dau xua, dau nuoc
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ((y nang) or (ly nang)) xa hoi. hieu qua dau xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ((y nang) OR (ly nang)) xa hoi. hieu qua dau xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ((y nang) or (ly nang)) xa hoi. hieu qua dau xuc van hanh vi cua tre*.