Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
trung cap » truong cao, trung tam
cap nhung » cam nhung, vap nhung, dap nhung
chi xanh » chi anh, chi danh, chi hanh
tan toan » tan tran, tap toan, van toan
bai toan » bai tap
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 cap nhung cong ((tan toan) or (bai toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - thanh trung cap nhung cong ((tan toan) OR (bai toan)) tap.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - thanh trung cap nhung cong ((tan toan) or (bai toan)) tap*.