Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
hang di » hang doi, hang vi, hang dien
truc va » thuc va, thuc vat, trung va
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tuc va » thuc va, tuc xa, duc va
ve cac » va cac, vien cac
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) OR (thu sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (truc va)) hang di va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (truc va)) hang di va triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky lang xa hoi. hieu ve cac ((tuc va) OR (truc va)) hang di va triet*.