Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh chat
trinh thuc » trinh tu, trinh thi
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
chao chu » cho chu, cua chu, cao cho
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan

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) or (chao chu)) xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (chao chu)) xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong dan phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (chao chu)) xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong dan phan tu".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (chao chu)) xanh - hanh ((trinh thuat) OR (trinh thuc)) nhung cong dan phan tu*.