Perhaps you should try some spelling variations:
hanh trinh » canh tranh
tieu sach » chieu sach, dien sach, te sach
quan hung » quang hung, quan nhung, luan hung
hung cong » nhung cong, hung cuong, phung cong
tap quang » tap quan, tac quang, tai quang
quang cao » nang cao, quang nam
cong tap » cuong tap, cong tac, cong tan

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 trinh) or (hanh chinh)) quan hung cong tap quang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh trinh) OR (hanh chinh)) quan hung cong tap quang cao.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh trinh) or (hanh chinh)) quan hung cong tap quang cao*.