Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
luan nhung » luan chung, luan hung, quan nhung
cong ngang » cong nhan, cong quang, cong lang
hoc thieu » toc thieu, hoc hien
cong vang » cong lang, cong quang, cong dong
anh dung » anh dong, anh huong, sach dung
cong san » cong tac
toan cao » toan ban, toan tap

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 - anh dung luan nhung ((((cong vang) OR (cong ngang))) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - anh dung luan nhung ((((cong vang) OR (cong ngang))) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - anh dung luan nhung ((((cong vang) OR (cong ngang))) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - anh dung luan nhung ((((cong vang) OR (cong ngang))) or (cong san)) toan cao*.