Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau dua » cau qua, cau cua, ca dua
cuu tre » cau tren, cau treo
dua ban » dia ban, cua ban, qua ban
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cua triet, dua tren
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: thu sach ty nang ((ma hoi) or (ma hoa)). hieu van cau dua ban thanh 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 van cau dua ban thanh 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 van cau dua ban thanh vai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (ma hoa)). hieu van cau dua ban thanh vai ((cuu tre) OR (cua tre))*.