Perhaps you should try some spelling variations:
tham nang » nham nang, tham lang, tham nhung
sach tham » sach nha
doc sach » hoc sach, toc sach, nuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
thuc day » thuc dan, thuc vat
lai cua » dai cua, hai cua, lai chau
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach tham nang ((x hoi) OR (o hoi)). lieu va cham ((thuc day) or (tuc xa)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach tham nang ((x hoi) OR (o hoi)). lieu va cham ((thuc day) OR (tuc xa)) hanh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach tham nang ((x hoi) OR (o hoi)). lieu va cham ((thuc day) or (tuc xa)) hanh lai cua tre*".