Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
trinh toan » tinh toan, thanh toan, trinh han
hoc thieu » toc thieu, hoc hien
cac dang » cao dang, cac dan, cac cong
lap bang » cao bang, mat bang, can bang
toan cao » toan ban, toan tap
lap ban » lap luan

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 - thanh trung ((cac dang) or (((lap bang) OR (lap ban)))) cong trinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh trung ((cac dang) OR (((lap bang) OR (lap ban)))) cong trinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh trung ((cac dang) or (((lap bang) OR (lap ban)))) cong trinh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh trung ((cac dang) or (((lap bang) OR (lap ban)))) cong trinh toan cao*.