Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
thuc dan » thuc hanh, thuc vat
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach van nang xa hoi. hieu va nam ((thuc dan) or (hoc dan)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach van nang xa hoi. hieu va nam ((thuc dan) OR (hoc dan)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: so sach van nang xa hoi. hieu va nam ((thuc dan) or (hoc dan)) hanh vi ve triet*.