Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phan duc » pham duc, phan tu, tran duc
tuan lai » tuan tai, xuan lai, tuong lai
van tuan » van quan, van ban, anh tuan
phan dau » phan tu, hang dau
hieu ke » hieu kem, chieu ke, hieu ky
co sach » bo sach, cuon sach, hoc sach
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 ke ((phan duc) OR (phan dau)) van tuan 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 ke ((phan duc) OR (phan dau)) van tuan 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 ke ((phan duc) OR (phan dau)) van tuan lai chau te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (co sach)) ky nang o hoi. hieu ke ((phan duc) OR (phan dau)) van tuan lai chau te*.