Perhaps you should try some spelling variations:
hoach quang » doanh quang, hoach bang, hoach luan
chi sang » chi lang, chieu sang, chi chang
va thong » va thuong, va phuong, va cong
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 sang - hoach quang ((va thong) or (he thong)) cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - hoach quang ((va thong) OR (he thong)) cong tan toan cao*.