Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
toan tap » toan 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: ((doi khi) OR (hoc thieu)) xanh - hanh trinh va ((nhung cong) OR (thong cong)) dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi khi) or (hoc thieu)) xanh - hanh trinh va ((nhung cong) OR (thong cong)) dan toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((doi khi) or (hoc thieu)) xanh - hanh trinh va ((nhung cong) OR (thong cong)) dan toan tap*.