Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
hang di » hang doi, hang vi, hang dien
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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: tu sach _ lang xa hoi. hieu ve cac ((tuc va) OR (thuc dan)) hang di va triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach _ lang xa hoi. hieu ve cac ((tuc va) or (thuc dan)) hang di va triet*.