Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
chieu qua » hieu qua, khien qua, hieu cua
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu qua - hanh ((trinh quan) or (trinh han)) dung cong tan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu qua - hanh ((trinh quan) OR (trinh han)) dung cong tan phan dau.
• Adding a wildcard symbol may retrieve word variants: ho chieu qua - hanh ((trinh quan) or (trinh han)) dung cong tan phan dau*.