Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cua triet, dua tren
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
ca dua » cay dua, ca cua, ca da
ma hoi » mai hoi, xa hoi, me hoi
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((ma hoi) or (ma hoa)). hieu va ca dua ban hang vai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((ma hoi) OR (ma hoa)). hieu va ca dua ban hang vai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((ma hoi) or (ma hoa)). hieu va ca dua ban hang vai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (ma hoa)). hieu va ca dua ban hang vai ((cuu tre) OR (cua tre))*.