Perhaps you should try some spelling variations:
tranh quang » tran quang, tinh quang, trinh quan
trinh quang » tinh quang, trinh quan, trinh dung
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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 hien xanh - hanh ((trinh quang) or (tranh quang)) dung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trinh quang) OR (tranh quang)) dung cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh quang) or (tranh quang)) dung cong tan toan cao*.