Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (hoc thieu)) xanh - hanh ((trinh quan) or (tinh cua)) dung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (hoc thieu)) xanh - hanh ((trinh quan) OR (tinh cua)) dung cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (hoc thieu)) xanh - hanh ((trinh quan) or (tinh cua)) dung cong tan toan cao*.