Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
nong cong » cong cong, tong cong, nang cong
cua nong » cua cong, cuu nong, cua dong
dan van » dang van, doan van, tan van
dao van » do 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: hoc ((chieu sang) or (thien thanh)) - hanh tranh cua nong cong ((dan van) OR (dao van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thien thanh)) - hanh tranh cua nong cong ((dan van) OR (dao van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (thien thanh)) - hanh tranh cua nong cong ((dan van) OR (dao van)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thien thanh)) - hanh tranh cua nong cong ((dan van) OR (dao van)) ban*.