Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu hien » bieu hien, dieu hien, chieu chien
xay thuc » cay thuc, day thuc, xa thuc
vat hanh » vat thanh, van hanh, va hanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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: vu sach ky nang xa hoi. ((hieu hien) or (thieu nien)) xay thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. ((hieu hien) OR (thieu nien)) xay thuc vat hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. ((hieu hien) or (thieu nien)) xay thuc vat hanh vi cua tre*.