Perhaps you should try some spelling variations:
hanh trinh » canh tranh
thieu xanh » chieu xanh, thien anh, thien danh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
vat thong » va thong, vat trong, mat thong
dong toan » dung toan, bong toan, cong toan
toan ban » van ban

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: hoc ((thieu xanh) OR (hieu manh)) - ((hanh trinh) OR (hanh chinh)) vat thong cong dong toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - ((hanh trinh) OR (hanh chinh)) vat thong cong dong toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - ((hanh trinh) OR (hanh chinh)) vat thong cong dong toan ban*.