Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » thong cong, hang cong, nhung don
hoc chieu » hoc thieu, ho chieu, hoc hien
tranh cua » doanh cua, manh cua
dung cong » dung trong
gian bana » gian ban, gian lang, gian lan
gian dan » gian lang

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 - hanh tranh cua ((nhung cong) or (dung cong)) dan ((gian bana) OR (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh tranh cua ((nhung cong) OR (dung cong)) dan ((gian bana) OR (gian dan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sang - hanh tranh cua ((nhung cong) or (dung cong)) dan ((gian bana) OR (gian dan))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh tranh cua ((nhung cong) or (dung cong)) dan ((gian bana) OR (gian dan))*.