Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trinh quan » trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
dan toan » van toan, dan than, manh toan
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 - hanh ((trinh quan) or (tinh quang)) ((dong cong) OR (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trinh quan) OR (tinh quang)) ((dong cong) OR (dung cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trinh quan) or (tinh quang)) ((dong cong) OR (dung cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trinh quan) or (tinh quang)) ((dong cong) OR (dung cong)) dan toan cao*.