Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (sac ky)) sang ((ma hoi) or (ma hoa)). hieu van cac dat va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) sang ((ma hoi) OR (ma hoa)). hieu van cac dat va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sac ky)) sang ((ma hoi) or (ma hoa)). hieu van cac dat va hanh vai cua vat*.