Perhaps you should try some spelling variations:
sinh trong » sinh truong, sinh trung, dinh trong
dieu luong » dieu tuong, tien luong, dien xuong
toan khoan » toan khoa, toan phan, toan hoat
hieu lang » chieu sang, hieu quang, nhieu tang
cong toan » cong tan, cong hoan, cong tuan
khoan cap » khoan cam, khan cap, khoa cap
doi hieu » doi chieu, doc hieu, doi hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - sinh trong ((dieu luong) or (dieu duong)) cong toan khoan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - sinh trong ((dieu luong) OR (dieu duong)) cong toan khoan cap.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - sinh trong ((dieu luong) or (dieu duong)) cong toan khoan cap*.