Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
quang van » quang ban, quan van, quang va
quang uan » quang tuan, quang ban, quang tran
doi sach » doc sach, moi sach, doi cach
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
do sach » doc sach, do sanh, bo sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((doi sach) OR (do sach)) - anh ((quang van) or (quang uan)) nhung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((doi sach) OR (do sach)) - anh ((quang van) OR (quang uan)) nhung cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((doi sach) OR (do sach)) - anh ((quang van) or (quang uan)) nhung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((doi sach) OR (do sach)) - anh ((quang van) or (quang uan)) nhung cong tan toan cao*.