Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
dang cau » hang cau, bang cau, dang mau
chat xuc » chat huu, cam xuc, chao xu
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
cuc tre » duc tre, cua tre, cuu tre
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu van
cau hoa » cau hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) dang cau hoa. ((hieu ve) OR (hieu va)) chat xuc ban thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) dang cau hoa. ((hieu ve) OR (hieu va)) chat xuc ban thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) dang cau hoa. ((hieu ve) OR (hieu va)) chat xuc ban thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) dang cau hoa. ((hieu ve) OR (hieu va)) chat xuc ban thanh tai cuc tre*.