Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
hac dat » hoc dat, tac dat, hoach dat
van hac » van hoc, van ha, van hai
vai cua » dai cua, hai cua, lai cua
sach ky » sach y, sach ty, sach kem
ma hoi » mai hoi, xa hoi, me hoi
sac ky » cac ky, sai ky

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