Perhaps you should try some spelling variations:
hanh trinh » canh tranh
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
toc hieu » toc thieu, doc hieu, hoc thieu
va thong » va thuong, va phuong, he thong
phan tap » phan lap, han tap, pha tap
va tong » va tuong, va trong, va cong

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu manh - ((hanh trinh) OR (hanh chinh)) ((va tong) OR (va thong)) cong vang phan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu manh - ((hanh trinh) or (hanh chinh)) ((va tong) OR (va thong)) cong vang phan tap~".
• Adding a wildcard symbol may retrieve word variants: toc hieu manh - ((hanh trinh) or (hanh chinh)) ((va tong) OR (va thong)) cong vang phan tap*.