Perhaps you should try some spelling variations:
thanh trung » thanh tung
trong manh » trong minh, trong anh, trong canh
trong mach » trong cac, trong minh, trong anh
doi chieu » doc hieu, doi chi, mot chieu
trung hoc » trung quoc
ho chieu » theo chieu, hoc thieu, mot chieu
hoc dung » hoc ung, hoc dan, tac dung
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) xanh - thanh trung hoc dung ((trong manh) OR (trong mach)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - thanh trung hoc dung ((trong manh) OR (trong mach)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) xanh - thanh trung hoc dung ((trong manh) OR (trong mach)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - thanh trung hoc dung ((trong manh) OR (trong mach)) toan cao*.