Perhaps you should try some spelling variations:
khanh sinh » khang sinh, khanh linh, khanh vinh
sinh cua » manh cua, dinh cuu, sinh va
te sach » toc sach
duc van » duc va, duc tan, duc manh
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
tu hanh » du hanh, lu hanh, thuc hanh
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao
o lao » o lai
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: te sach tu hanh ((o hoi) or (o lao)). lieu va cam ((luc va) or (duc van)) khanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu hanh ((o hoi) OR (o lao)). lieu va cam ((luc va) OR (duc van)) khanh sinh cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu hanh ((o hoi) or (o lao)). lieu va cam ((luc va) or (duc van)) khanh sinh cua tre*.