Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung tung » nhung tuong, nhung dung, nhung vung
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh cua » tinh cua, trinh luat, trinh luan
tung dan » dung dan, huong dan, trung dai
dan toan » van toan, dan than, manh toan
toan cau » 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 hien xanh - hanh ((trinh cua) or (trinh quan)) nhung tung dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trinh cua) OR (trinh quan)) nhung tung dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh cua) or (trinh quan)) nhung tung dan toan cau*.