Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
ham sach » pham sach, nam sach, hau sach
lam sach » nam sach, pham sach, lam sang
trinh va » trinh van, trinh vat, trinh ve
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((ham sach) OR (lam sach)) - hanh trinh va ((dang cong) OR (dung cong)) dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((ham sach) OR (lam sach)) - hanh trinh va ((dang cong) OR (dung cong)) dan toan cao*.