Perhaps you should try some spelling variations:
van lang » van nang, va lang, van hang
su sach » so sach
danh vi » hanh vi, dinh vi, danh di
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, vu khach
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) van lang xa hoi. hieu vu cham ((luc va) OR (tuc va)) danh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) van lang xa hoi. hieu vu cham ((luc va) OR (tuc va)) danh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van lang xa hoi. hieu vu cham ((luc va) OR (tuc va)) danh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van lang xa hoi. hieu vu cham ((luc va) OR (tuc va)) danh vi cua vat*.