Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » hanh trinh, minh trang, tinh trang
tieu sach » chieu sach, dien sach, te sach
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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