Perhaps you should try some spelling variations:
quang khang » quang khanh, quang thanh, quang khai
thieu sach » chieu sach, thien hach, theo sach
cong quang » luong quang, thong quang, duong quang
khang cong » hang cong, dang cong, phan cong
hieu cach » hieu cac, chieu sach, hieu ca
cong tan » cong tac, cong san, cong thanh
tan chat » van chat, tao chat, ban chat
chat ban » nhat ban, chat ran, cua ban

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 sach) or (hieu cach)) - thanh cong quang khang cong tan chat ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh cong quang khang cong tan chat ban*.