Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan thong » quang thong, quan trong, xuan thong
thong cong » trong cong, tong cong, thong thong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
san thanh » van thanh, son thanh, dan thanh
ban thanh » ban hanh, ban hang
san than » sang than, ban than, van than

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 chiet tach - hanh trinh quan thong cong ((san than) OR (((san thanh) OR (ban thanh)))) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh trinh quan thong cong ((san than) or (((san thanh) OR (ban thanh)))) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh trinh quan thong cong ((san than) or (((san thanh) OR (ban thanh)))) ban*.