Perhaps you should try some spelling variations:
sach thien » sach thieu, cach thien, sach tren
sach tien » sach tren, sach thieu
ban hang » ngan hang
cham xuc » cam xuc, chat xuc, cham soc
xuc ban » duc ban, cuc ban, quoc ban
hang vi » hang va, hanh vi, hang di
quan xa » quan ha, quan va, quan cua
hieu ve » hieu van
hieu va » lieu va, hieu qua
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: tu ((sach thien) or (sach tien)) quan xa hoi. ((hieu ve) OR (hieu va)) cham xuc ban hang vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thien) OR (sach tien)) quan xa hoi. ((hieu ve) OR (hieu va)) cham xuc ban hang vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thien) or (sach tien)) quan xa hoi. ((hieu ve) OR (hieu va)) cham xuc ban hang vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thien) or (sach tien)) quan xa hoi. ((hieu ve) OR (hieu va)) cham xuc ban hang vi cua vat*.