Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
day hanh » day nhanh, day thanh, dao hanh
sach van » sach han, sach va, bach van
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
ve cac » va cac, vien cac
cua te » cua tu

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 van nang xa hoi. hieu ((ve cac) or (((va cam) OR (va cao)))) thuc day hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang xa hoi. hieu ((ve cac) OR (((va cam) OR (va cao)))) thuc day hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van nang xa hoi. hieu ((ve cac) or (((va cam) OR (va cao)))) thuc day hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: su sach van nang xa hoi. hieu ((ve cac) or (((va cam) OR (va cao)))) thuc day hanh di cua te*.