Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van xuan » van quan, van tuan, van xuat
xuan lai » xuan mai, xuan loi, xuan thai
co sach » bo sach, cuon sach, hoc sach
ve phan » va phan, ve phat, vi phan
ke phan » kenh phan, ke thang
duc van » duc va, duc tan, duc manh
chau te » chau tho
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (co sach)) ky nang o hoi. hieu ((ve phan) OR (ke phan)) duc van xuan lai chau te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (co sach)) ky nang o hoi. hieu ((ve phan) OR (ke phan)) duc van xuan lai chau te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (co sach)) ky nang o hoi. hieu ((ve phan) OR (ke phan)) duc van xuan lai chau te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (co sach)) ky nang o hoi. hieu ((ve phan) OR (ke phan)) duc van xuan lai chau te*.