Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trung tang » trung thang, trong tang, trung thanh
hoc thieu » toc thieu, hoc hien
trung tan » trung tuan, trung tran, truong tan
cuong tap » luong tap, cong tac, luong tai
cong tap » cong tac, cong tan, tong tap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - manh ((trung tan) OR (trung tang)) dung ((cong tap) or (cuong tap)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - manh ((trung tan) OR (trung tang)) dung ((cong tap) OR (cuong tap)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - manh ((trung tan) OR (trung tang)) dung ((cong tap) or (cuong tap)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - manh ((trung tan) OR (trung tang)) dung ((cong tap) or (cuong tap)) toan tap*.