Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tuong cua » truong cua, huong cua, thong cua
trong tan » trong quan, trong cac, trong ca
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, dung cua, tang cua
tan toan » tan tran, tap toan, van toan
toan cau » 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: doc hieu xanh - thanh ((tung cua) or (tuong cua)) dung trong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((tung cua) OR (tuong cua)) dung trong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung cua) or (tuong cua)) dung trong tan toan cau*.