Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
lang van » dang van, tang van, hoang van
thuc day » thuc dan, thuc vat
hai cua » thai cua, dai cua, hoi cua
thi van » thi lan, thi hanh, thi nang
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach tham)) lang van hoi. thi van nam ((luc va) or (thuc day)) nhanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) lang van hoi. thi van nam ((luc va) OR (thuc day)) nhanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach tham)) lang van hoi. thi van nam ((luc va) or (thuc day)) nhanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach tham)) lang van hoi. thi van nam ((luc va) or (thuc day)) nhanh hai cua tre*.