Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh trinh » canh tranh, hanh chinh
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
cong dan » cong san, cong tan, cong dong
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chiet tach) or (nhieu tang)) - hanh trinh ve thong ((cong dan) OR (huong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chiet tach) OR (nhieu tang)) - hanh trinh ve thong ((cong dan) OR (huong dan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chiet tach) or (nhieu tang)) - hanh trinh ve thong ((cong dan) OR (huong dan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chiet tach) or (nhieu tang)) - hanh trinh ve thong ((cong dan) OR (huong dan)) toan tap*.