Perhaps you should try some spelling variations:
hanh trang » thanh trung, minh trang, tinh trang
hanh trinh » hanh chinh
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap

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 - ((hanh trang) or (((hanh trinh) OR (canh tranh)))) va nhung cong tan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh trang) OR (((hanh trinh) OR (canh tranh)))) va nhung cong tan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - ((hanh trang) or (((hanh trinh) OR (canh tranh)))) va nhung cong tan than cao".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh trang) or (((hanh trinh) OR (canh tranh)))) va nhung cong tan than cao*.