Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
vat nhung » va nhung, vai nhung, ve nhung
vap nhung » va nhung, ve nhung, voi nhung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chinh sach) or (hieu manh)) - hanh trinh ((vat nhung) OR (vap nhung)) cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chinh sach) OR (hieu manh)) - hanh trinh ((vat nhung) OR (vap nhung)) cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chinh sach) or (hieu manh)) - hanh trinh ((vat nhung) OR (vap nhung)) cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chinh sach) or (hieu manh)) - hanh trinh ((vat nhung) OR (vap nhung)) cong dan toan cao*.