Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
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 sach) or (thu hoach)) ky lang xa hoi. ((hieu va) or (hieu qua)) cam luc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky lang xa hoi. ((hieu va) OR (hieu qua)) cam luc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky lang xa hoi. ((hieu va) or (hieu qua)) cam luc van hanh vi cua tre*.