Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
qua cac » cua cac
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
qua ca » qua cua, qua cai, quan cau

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 ty) or (sach tu)) nang ma hoi. hieu ((qua ca) OR (qua cac)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) nang ma hoi. hieu ((qua ca) OR (qua cac)) xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tu)) nang ma hoi. hieu ((qua ca) OR (qua cac)) xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) nang ma hoi. hieu ((qua ca) OR (qua cac)) xuc van hanh vi cua tre*.