Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
cac do » cac don, cac doi, cac du
do van » dao van, vo van, so van
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: te ((sach ky) or (sach ty)) ((nang xa) or (dang xay)) hoi. hieu va cac do van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) ((nang xa) OR (dang xay)) hoi. hieu va cac do van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) ((nang xa) or (dang xay)) hoi. hieu va cac do van hanh vi cua tre*.