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
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
dau xuc » dau xac, dau xua, dau nuoc
qua dau » qua da, qua bau, qua dan
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
di cua » dai cua, doi cua, de 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 di 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 di 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 di cua tre*.