Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
chu xanh » chu manh, chieu xanh, chua xang
tang van » dang van, hoang van, trong van
toan cau » toan cao, toan ban, toan tap
cho chu » cho thue
tang va » trang va, thang va, tang vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho chu xanh - hanh ((tang va) OR (tang van)) ((nhung cong) or (hang cong)) tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho chu xanh - hanh ((tang va) OR (tang van)) ((nhung cong) OR (hang cong)) tinh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho chu xanh - hanh ((tang va) OR (tang van)) ((nhung cong) or (hang cong)) tinh toan cau".
• Adding a wildcard symbol may retrieve word variants: cho chu xanh - hanh ((tang va) OR (tang van)) ((nhung cong) or (hang cong)) tinh toan cau*.