Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
va triet » va thiet, va trien, ve triet
thuc van » thuc vat, thuc dan, thuc va
hang di » hang doi, hang vi, hang dien
tuc van » truc van, tuc va, duc van
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
ve cam » ve cham, ve cac, va cam
di va » dai va, di vao, doi va

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: so sach thue ((nang xa) OR (nang x)) hoi. hieu ve cam ((tuc van) OR (thuc van)) hang di va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thue ((nang xa) or (nang x)) hoi. hieu ve cam ((tuc van) OR (thuc van)) hang di va triet~".
• Adding a wildcard symbol may retrieve word variants: so sach thue ((nang xa) or (nang x)) hoi. hieu ve cam ((tuc van) OR (thuc van)) hang di va triet*.