Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh yen » tinh yeu, tinh dien, tinh son
va tuyen » va truyen, ke tuyen
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
tuc va » thuc va, truc va, duc va
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu va cao ((tuc va) or (tuc xa)) tinh yen ((va tuyen) OR (tac tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu va cao ((tuc va) OR (tuc xa)) tinh yen ((va tuyen) OR (tac tuyen))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu va cao ((tuc va) or (tuc xa)) tinh yen ((va tuyen) OR (tac tuyen))*".