Perhaps you should try some spelling variations:
hoc chieu » hoc thieu, ho chieu, hoc dieu
trinh thi » trinh tai, dinh thi, trinh tin
nang cong » nang song, dang cong, bang cong
dan thanh » dang thanh, danh thanh, ban thanh
thanh lap » thanh san, phan lap, thanh hai
trinh tu » trinh ky, trinh do
cong dan » cong san, cong tan, huong dan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) tinh - hanh ((trinh thi) OR (trinh tu)) nang cong dan thanh lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (hoc hien)) tinh - hanh ((trinh thi) or (trinh tu)) nang cong dan thanh lap~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (hoc hien)) tinh - hanh ((trinh thi) or (trinh tu)) nang cong dan thanh lap*.