Perhaps you should try some spelling variations:
hieu voi » hieu moi, lieu voi, hieu loi
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
pham cuu » pham huu, cham cuu, pham cua
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
hieu vi » hieu va, hieu ve, hien vi
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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) or (thu sach)) ky dang xa hoi. ((hieu vi) OR (hieu voi)) pham cuu ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky dang xa hoi. ((hieu vi) OR (hieu voi)) pham cuu ban hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky dang xa hoi. ((hieu vi) OR (hieu voi)) pham cuu ban hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky dang xa hoi. ((hieu vi) OR (hieu voi)) pham cuu ban hanh vai cua tre*.