Perhaps you should try some spelling variations:
trong manh » trong minh, trong anh, trong mach
hieu xanh » chieu xanh, hieu manh, hieu nganh
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan ban, toan tap
manh va » hanh va, minh va, lanh va
anh va » hanh va

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 - cach ((manh va) or (anh va)) dung trong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - cach ((manh va) OR (anh va)) dung trong manh toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - cach ((manh va) or (anh va)) dung trong manh toan cau*.