Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
trinh chuan » trinh han, trinh quan, trinh luan
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
xang cong » dang cong, hang cong, nang cong
bang cong » dang cong, bang song, hang cong
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (thien thanh)) - hanh trinh chuan ((xang cong) or (bang cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien thanh)) - hanh trinh chuan ((xang cong) OR (bang cong)) dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - hanh trinh chuan ((xang cong) or (bang cong)) dan than cau*.