Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh qua » trinh quan, trinh cua, trinh luat
dan toan » dan than, manh toan, xuan toan
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 hien xanh - hanh ((trinh qua) OR (trinh quang)) nhung cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trinh qua) OR (trinh quang)) nhung cong ((dan toan) OR (van toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((trinh qua) OR (trinh quang)) nhung cong ((dan toan) or (van toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh qua) OR (trinh quang)) nhung cong ((dan toan) or (van toan)) cau*.