Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
dua ban » dia ban, cua ban, qua ban
cau dua » cau qua, cau cua, ca dua
van cau » van dau, van hau, van chat
sai ky » sac ky
ma hoi » xa hoi, ma hoa, me hoi
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sai ky) or (cac ky)) nang ((ma hoi) OR (mai hoi)). hieu van cau dua ban thanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (cac ky)) nang ((ma hoi) OR (mai hoi)). hieu van cau dua ban thanh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) or (cac ky)) nang ((ma hoi) OR (mai hoi)). hieu van cau dua ban thanh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) or (cac ky)) nang ((ma hoi) OR (mai hoi)). hieu van cau dua ban thanh tai cuc te*.