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 » thu sach, chieu sach, chuc hach
cau sach » cao sach, hau sach, rau 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 (cau 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 (cau sach)) - hanh trinh cua thong cong ((van toan) OR (van tan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chao ((chu sach) or (cau sach)) - hanh trinh cua thong cong ((van toan) OR (van tan)) cao".
• Adding a wildcard symbol may retrieve word variants: chao ((chu sach) or (cau sach)) - hanh trinh cua thong cong ((van toan) OR (van tan)) cao*.