Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh vi » hanh vi, dinh vi, danh di
sach tu » sach thu, cach tu, sach uu
va danh » va dinh, va dan, va hanh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va
sach ty » sach y, sach thu, xach tay
vi cua » vai cua, di cua
cua te » cua tu
ang xa » lang xa, mang xa, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) or (sach tu)) ang xa hoi. ((hieu ve) or (hieu van)) cac duc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach tu)) ang xa hoi. ((hieu ve) OR (hieu van)) cac duc va danh vi cua te.
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sach tu)) ang xa hoi. ((hieu ve) or (hieu van)) cac duc va danh vi cua te*.