Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
trinh chat » tinh chat, trinh luat, trinh han
chat quang » chat luong, pham quang
quang cong » quang cuong, quang dong, quang hoang
tac than » tac thanh, tam than, bac thanh
tac nhan » tao nhan, cac nhan, dac nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu xanh - hanh trinh chat quang cong ((tac than) or (tac nhan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - hanh trinh chat quang cong ((tac than) OR (tac nhan)) cau.
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh trinh chat quang cong ((tac than) or (tac nhan)) cau*.