Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
cham cua » chat cua, cham cuu, ham cua
bo sach » co sach, hoc sach
hien tu » khien tu
hoa hoi » khoa hoi, hoa hoc, hoa doi
ly dong » ly dung, lao dong, huy dong
ky dong » ky dang, ky cong, ty dong
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ((ky dong) or (ly dong)) hoa hoi. ((hien tu) OR (dien tu)) cham cua ban thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ((ky dong) OR (ly dong)) hoa hoi. ((hien tu) OR (dien tu)) cham cua ban thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ((ky dong) or (ly dong)) hoa hoi. ((hien tu) OR (dien tu)) cham cua ban thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: bo sach ((ky dong) or (ly dong)) hoa hoi. ((hien tu) OR (dien tu)) cham cua ban thanh va cua te*.