Perhaps you should try some spelling variations:
hien sang » hien trang, khien bang, chieu sang
hanh tran » hanh trang, thanh tran, hanh tram
van dang » van dong, van nang, van dan
van dung » van dong, xay dung, tin dung
cong san » cong tac
san tuan » van tuan, san luan, san quan
tuan tap » toan tap, tuan tai, tuyen tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sang - hanh tran ((van dang) or (van dung)) cong san tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh tran ((van dang) OR (van dung)) cong san tuan tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh tran ((van dang) or (van dung)) cong san tuan tap*.