Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
hoc nhung » hoa nhung, hon nhung, nuoc nhung
manh toan » thanh toan, anh tuan, tinh toan
tung hoc » trung hoc, tuong hoc, dung hoc
van toan » van tuan, van tan, van thanh

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 tung hoc nhung cong ((manh toan) or (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung hoc nhung cong ((manh toan) OR (van toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung hoc nhung cong ((manh toan) or (van toan)) cao*.