Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
van lam » van nam
thi van » thi lan, thi hanh, thi nang
mang xa » lang xa, mang may, dang xay
bang xa » lang xa, bang va, ang xa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu ((bang xa) OR (mang xa)) hoi. thi van lam ((xuc va) or (thuc vat)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((bang xa) OR (mang xa)) hoi. thi van lam ((xuc va) OR (thuc vat)) hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((bang xa) OR (mang xa)) hoi. thi van lam ((xuc va) or (thuc vat)) hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((bang xa) OR (mang xa)) hoi. thi van lam ((xuc va) or (thuc vat)) hanh tai cua tre*.