Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
hieu ve » hieu va, hieu van
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 nang ((o hoi) or (o hai)). hieu ve cam ((xuc van) OR (duc van)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang ((o hoi) OR (o hai)). hieu ve cam ((xuc van) OR (duc van)) hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang ((o hoi) or (o hai)). hieu ve cam ((xuc van) OR (duc van)) hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang ((o hoi) or (o hai)). hieu ve cam ((xuc van) OR (duc van)) hanh lai cua tre*.