Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thien quan » trien quang, lien quan, thien van
hanh hang » thanh hang, hang hang, hanh han
tran tuan » tran xuan, tran quang, tran thanh
hang cao » hoang cao, nang cao, hang ca
ung cong » dung cong, luong cong, duong cong
cong san » cong tac
toan tap » toan ban
cao ung » cao dung, cac ung, cho ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quang) or (thien quan)) - hanh hang cao ung cong san ((tran tuan) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (thien quan)) - hanh hang cao ung cong san ((tran tuan) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) or (thien quan)) - hanh hang cao ung cong san ((tran tuan) or (toan tap))*.