Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
thuc day » thuc dan, thuc vat
thuc dao » thuc dan, chuc dao, thuc cao
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cao, va cai
di cua » dai cua, doi cua, de cua
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 ((va cac) or (va cam)) ((thuc dao) OR (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 ((va cac) OR (va cam)) ((thuc dao) OR (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 ((va cac) or (va cam)) ((thuc dao) OR (thuc day)) hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: su sach van nang xa hoi. hieu ((va cac) or (va cam)) ((thuc dao) OR (thuc day)) hanh di cua te*.