Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien hanh » dieu hanh
thong dan » thong van, tuong dan, thong den
dien anh » tieng anh, dien dan
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
dan van » dang van, doan van, dao van
ban cao » bao cao, ban can, ban co

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) or (dien anh)) - thanh trung va thong dan van ban cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (dien anh)) - thanh trung va thong dan van ban cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (dien anh)) - thanh trung va thong dan van ban cao*.