Perhaps you should try some spelling variations:
trinh thuat » trinh thiet, trinh thuc, trinh chat
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - hanh ((trinh thuat) OR (trinh luat)) dung cong tan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trinh thuat) OR (trinh luat)) dung cong tan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trinh thuat) OR (trinh luat)) dung cong tan ((toan cau) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trinh thuat) OR (trinh luat)) dung cong tan ((toan cau) or (toan tap))*.