Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
cong cong » cong dong, trong cong, dung cong
hong hanh » dong thanh, cong thanh, hong ha
manh toan » thanh toan, anh tuan, tinh toan
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - hanh trinh quan ((cong cong) or (hong hanh)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - hanh trinh quan ((cong cong) OR (hong hanh)) manh toan ban*.