Perhaps you should try some spelling variations:
quang dung » quang trung, ung dung, cuong dung
hanh hang » thanh hang, hang hang, hanh mang
theo cao » theo cap, theo giao, thuoc cao
cao sach » co sach, ao sach, cau sach
hanh han » hanh nhan, hanh phan, hanh san
qua dung » su dung, qua song, qua cong
cong dan » cong san, cong tan, huong dan
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cao sach - ((hanh hang) or (hanh han)) ((qua dung) or (quang dung)) cong dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cao sach - ((hanh hang) OR (hanh han)) ((qua dung) OR (quang dung)) cong dan can cau*.