Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
canh trinh » canh tranh, hanh trinh, canh tinh
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
qua trong » qua trinh, qua song, qua cong
cong tac » cong ty
tac hang » tac vang, bac thang, tac chong

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu quang - canh trinh ((qua trong) or (quan trong)) cong tac hang va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - canh trinh ((qua trong) OR (quan trong)) cong tac hang va.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - canh trinh ((qua trong) or (quan trong)) cong tac hang va*.