Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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 trinh thuat ((hang cong) OR (dang cong)) san ((than tap) or (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh trinh thuat ((hang cong) OR (dang cong)) san ((than tap) OR (han tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh trinh thuat ((hang cong) OR (dang cong)) san ((than tap) or (han tap))".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh trinh thuat ((hang cong) OR (dang cong)) san ((than tap) or (han tap))*.