Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
tuan nhung » quan nhung, tuan hung, thuat nhung
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - thanh trung tuan nhung cong ((tan tran) or (((bai toan) or (bai tap)))) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh trung tuan nhung cong ((tan tran) OR (((bai toan) OR (bai tap)))) tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh trung tuan nhung cong ((tan tran) or (((bai toan) or (bai tap)))) tap*.