Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van khanh
kho tang » cao tang
nhan cua » nhat cua, nhan luc, nhan su
than cua » thai cua, ban cua, gian cua
tang xa » trang xa, tang ma, lang xa
sai kho » dai kho, tai khoa, dai khoa
duc van » duc va, duc tan, duc manh
su sai » su tai, su hai, su dai
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sai kho tang xa hoi. hieu ((ve cam) OR (ve cac)) duc van nhanh ((than cua) OR (nhan cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai kho tang xa hoi. hieu ((ve cam) OR (ve cac)) duc van nhanh ((than cua) or (nhan cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sai kho tang xa hoi. hieu ((ve cam) OR (ve cac)) duc van nhanh ((than cua) or (nhan cua)) tre*.