Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
chu sach » cau sach, thu sach, chieu sach
cao sach » co sach, ao sach, cau sach
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao ((chu sach) or (cao sach)) - hanh trinh cua thong cong ((van toan) or (van tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao ((chu sach) OR (cao sach)) - hanh trinh cua thong cong ((van toan) OR (van tan)) cao.
• Adding a wildcard symbol may retrieve word variants: chao ((chu sach) or (cao sach)) - hanh trinh cua thong cong ((van toan) or (van tan)) cao*.