Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
khien tu » dien tu
khoa hoi » khoan hoi, khoa hoc, khoa doi
van cua » vang cua, ban cua, dan cua
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
so sach » so sanh, bo sach, co sach
tu cham » toc cham, thi cham
sach ky » sac ky, sach y, sach ty
hoa hoi » hoa hoc, hoa doi, hoc hoi
ky dang » ky nang, ky danh
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: so sach ky dang ((hoa hoi) OR (khoa hoi)). khien tu cham ((xuc van) or (duc van)) thanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang ((hoa hoi) OR (khoa hoi)). khien tu cham ((xuc van) OR (duc van)) thanh van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang ((hoa hoi) OR (khoa hoi)). khien tu cham ((xuc van) or (duc van)) thanh van cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang ((hoa hoi) OR (khoa hoi)). khien tu cham ((xuc van) or (duc van)) thanh van cua te*.