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 vat » trinh van, trinh luat, sinh vat
vat thong » va thong, vat trong, mat thong
cong van » cong vang, song van, cong tan
cong san » cong tac
tuan ca » tan ca, tuan cu, thuan cam

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

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