Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
luong quan » thong quan, duong qua
trinh than » trinh thanh, trinh han, trinh toan
huong cua » dung cua
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu nganh - thanh ((huong cua) or (luong quan)) dung cong trinh than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - thanh ((huong cua) OR (luong quan)) dung cong trinh than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - thanh ((huong cua) or (luong quan)) dung cong trinh than cau*.