Perhaps you should try some spelling variations:
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
hanh trinh » canh tranh, hanh chinh
cong thanh » dong thanh, cong tan, truong thanh
trinh vat » trinh van, trinh luat, sinh vat
vat hang » van hang, dat hang, va hang
tran ban » tranh ban, tran van, 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: doc ((chieu sang) OR (chieu xanh)) - hanh trinh vat hang ((cong thanh) or (cong trinh)) tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu xanh)) - hanh trinh vat hang ((cong thanh) OR (cong trinh)) tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu sang) OR (chieu xanh)) - hanh trinh vat hang ((cong thanh) or (cong trinh)) tran ban".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) OR (chieu xanh)) - hanh trinh vat hang ((cong thanh) or (cong trinh)) tran ban*.