Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
tieu sach » chieu sach, dien sach, te sach
cong san » cong tac
san than » sang than, san thanh, 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 (thanh tung)) va nhung cong san than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh trang) OR (thanh tung)) va nhung cong san than cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh trang) or (thanh tung)) va nhung cong san than cao*.