Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
trang va » tran van, hang va
thang va » hang va, thong va, thanh va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
tang va » tang van, tang vat, hang va

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

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