Perhaps you should try some spelling variations:
van gianh » van giang, van gian, dan gian
thu sach » tu sach, thuat sach, thuoc sach
va gianh » va gian, van giang, va giai
va triet » va thiet, va trien, ve triet
cong cua » cong cu, dong cua, huong cua
sach ky » sac ky, sach y, sach ty
song xa » song cua
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
lai va » loai va, mai va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((song xa) or (cong cua)) hoi. hieu va cam xuc ((van gianh) OR (va gianh)) lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((song xa) OR (cong cua)) hoi. hieu va cam xuc ((van gianh) OR (va gianh)) lai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((song xa) or (cong cua)) hoi. hieu va cam xuc ((van gianh) OR (va gianh)) lai va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((song xa) or (cong cua)) hoi. hieu va cam xuc ((van gianh) OR (va gianh)) lai va triet*.