Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu dang » thu hang, thu bang, thu dong
dang xay » dang van, van xay
su sach » so sach, vu sach
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va lam » van lam, va lap
loc va » luc va
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: su sach thu dang xay hoi. hieu va lam ((loc va) or (hoc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu dang xay hoi. hieu va lam ((loc va) OR (hoc va)) hanh vi cua tre*.