Perhaps you should try some spelling variations:
hoc thieu » hoc hien
hanh dinh » thanh dinh, hinh dinh, hanh tinh
dinh chuc » dinh chi, dinh thuy, dinh cuu
chuc dung » thuc dung, thuoc dung, chuc nang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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 (toc thieu)) tinh - hanh dinh chuc dung cong tan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) tinh - hanh dinh chuc dung cong tan khan cap*.