Perhaps you should try some spelling variations:
nhanh thang » nhanh thanh, nhanh quang, nhanh chong
hanh trang » thanh trung, canh tranh, hanh trinh
tieu sach » chieu sach, dien sach, te sach
nang cong » nang song, dang cong, bang cong
van nang » van quang, van ban, van dong
tran van » luan van
tan van » tang van, luan van, dang van

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