Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
nhung don » nhung van, nhung bo
chi xanh » chi anh, chi danh, chi hanh
tap toan » tap doan, tap quan, bai toan
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - ((thanh trung) or (thanh thang)) va ((nhung don) or (thong cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - ((thanh trung) OR (thanh thang)) va ((nhung don) OR (thong cong)) tap toan ban.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - ((thanh trung) or (thanh thang)) va ((nhung don) or (thong cong)) tap toan ban*.