Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
hoc thieu » hoc hien
trinh qua » trinh quan, trinh cua, trinh luat
song cong » cong cong, tong cong, song hong
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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) or (toc thieu)) xanh - hanh ((trinh qua) OR (trinh quang)) song cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) xanh - hanh ((trinh qua) OR (trinh quang)) song cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) xanh - hanh ((trinh qua) OR (trinh quang)) song cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) xanh - hanh ((trinh qua) OR (trinh quang)) song cong tac toan cao*.