Perhaps you should try some spelling variations:
nhanh dai » nhan dai, nhanh hai, nhanh thai
van nhanh » van thanh, van hanh, van khanh
sach doi » sach hoi, sach moi, sach dao
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
lang ha » long ha
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va cam » va cac, va cao, va cai

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 doi ((nang xa) or (lang ha)) hoi. hieu ((va cam) OR (va cham)) duc van nhanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi ((nang xa) OR (lang ha)) hoi. hieu ((va cam) OR (va cham)) duc van nhanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach doi ((nang xa) or (lang ha)) hoi. hieu ((va cam) OR (va cham)) duc van nhanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach doi ((nang xa) or (lang ha)) hoi. hieu ((va cam) OR (va cham)) duc van nhanh dai cua tre*.