Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
toan cao » toan ban
toan tap » toan 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 cau sach - hanh trinh luan ((hang cong) or (hang nong)) san ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - hanh trinh luan ((hang cong) OR (hang nong)) san ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo cau sach - hanh trinh luan ((hang cong) or (hang nong)) san ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo cau sach - hanh trinh luan ((hang cong) or (hang nong)) san ((toan cao) OR (toan tap))*.