Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
hien nhanh » hien hanh, thien thanh, tien thanh
hien xanh » hien hanh, chieu xanh, hien khanh
trinh qua » trinh quan, trinh cua, trinh luat
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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) OR (hien nhanh)) - hanh ((trinh qua) or (trinh quang)) dung cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh ((trinh qua) OR (trinh quang)) dung cong tan tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - hanh ((trinh qua) or (trinh quang)) dung cong tan tran cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) OR (hien nhanh)) - hanh ((trinh qua) or (trinh quang)) dung cong tan tran cau*.