Perhaps you should try some spelling variations:
trung thanh » truong thanh
trong thanh » truong thanh, rong thanh, thong thanh
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trinh ung » trinh dung, trinh duong, trinh nhung
doc hieu » toc thieu, hoc thieu, hoc hien
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 - hanh trinh ung dung ((trong thanh) or (trung thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trinh ung dung ((trong thanh) OR (trung thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh ung dung ((trong thanh) or (trung thanh)) toan cao*.