Perhaps you should try some spelling variations:
dong luong » cong luong, dong duong, dong huong
hien hanh » dieu hanh
thang va » hang va, trang va, thong va
luong va » dung va
hanh tap » han tap, hanh tai, hang tap
tang va » trang va, tang van, tang vat
va hanh » van hanh, va thanh, va danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - hanh ((tang va) or (thang va)) dong luong va hanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - hanh ((tang va) OR (thang va)) dong luong va hanh tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - hanh ((tang va) or (thang va)) dong luong va hanh tap*.