Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
cong san » cong tac
san chat » van chat, san chay, ban chat
chat cau » chat cam, chat cao, chat va

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) OR (trinh han)))) dung cong san chat cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trinh cua) OR (((trinh quan) OR (trinh han)))) dung cong san chat cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((trinh cua) or (((trinh quan) OR (trinh han)))) dung cong san chat cau*".