Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trinh » canh tranh, hanh chinh
cap thuong » chap thuong, ca thuong, cao thuong
thuong con » thuong dong, truong cong, thong cong
tieu sach » chieu sach, dien sach, te sach
tac than » tac thanh, tam than, tac nhan
than tap » toan tap, han tap, phan tap
con tac » cong tac, con tap, can tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - ((thanh trung) or (hanh trinh)) cap thuong con tac than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((thanh trung) OR (hanh trinh)) cap thuong con tac than tap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((thanh trung) or (hanh trinh)) cap thuong con tac than tap*.