Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
nang cong » nang song, dang cong, bang cong
cong van » cong vang, cong san, song van
toan tap » toan ban
tan tap » han tap, tan tat, man tap

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