Perhaps you should try some spelling variations:
quang cong » quang cuong, quang dong, quang hoang
doi chieu » doc hieu, mot chieu, thi chieu
ho chieu » theo chieu, hoc thieu, mot chieu
hanh tan » thanh tan, hanh san, hanh tai
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan tap » phan lap, han tap, pha 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: ((ho chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tan tran quang cong tac phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (((doi chieu) OR (doi chi)))) tinh - hanh tan tran quang cong tac phan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tan tran quang cong tac phan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (((doi chieu) OR (doi chi)))) tinh - hanh tan tran quang cong tac phan tap*.