Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hang tai » hang va, dung tai
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
cay dia » cac dia, cay dua, cay tia
van cay » van cau, van bay, van ca
cua tre » cua te, cuu tre, cua triet
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, me hoi

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) OR (thu sach)) ty nang ((ma hoi) or (ma hoa)). hieu van cay dia ban hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang ((ma hoi) OR (ma hoa)). hieu van cay dia ban hang tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ((ma hoi) or (ma hoa)). hieu van cay dia ban hang tai cua tre*".