Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
cua cau » cua cac, cua chu, cua cay
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach y)) nang ((o hoi) or (o hoc)). hieu van cam tuc va hanh dai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach y)) nang ((o hoi) OR (o hoc)). hieu van cam tuc va hanh dai cua cau.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach y)) nang ((o hoi) or (o hoc)). hieu van cam tuc va hanh dai cua cau*.