Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien tinh » khien tinh, thien tinh, bien tinh
hai duong » dai cuong, hai phong
trong dan » trong dang, trong san, trong tan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
am dung » am duong, lam dung, ap dung

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 tinh - thanh trung ((am dung) or (hai duong)) trong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - thanh trung ((am dung) OR (hai duong)) trong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - thanh trung ((am dung) or (hai duong)) trong dan toan cao*.