Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hang cho » sang cho, hang khoa, phong cho
thanh vi » thanh va, thanh ve, nhanh vi
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cua cau » cua cac, cua chu, cua cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach thu hang cho hoc. ((hieu ve) or (hieu qua)) cac xuc van ((thanh vi) OR (hanh vi)) cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach thu hang cho hoc. ((hieu ve) OR (hieu qua)) cac xuc van ((thanh vi) OR (hanh vi)) cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach thu hang cho hoc. ((hieu ve) or (hieu qua)) cac xuc van ((thanh vi) OR (hanh vi)) cua cau*".