Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
su triet » su viet, su tien, ve triet
thanh di » thanh de, thanh do, thanh dinh
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang ma) or (hang va)) hoi. hieu va cam xuc va ((thanh di) OR (thanh doi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (hang va)) hoi. hieu va cam xuc va ((thanh di) OR (thanh doi)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (hang va)) hoi. hieu va cam xuc va ((thanh di) OR (thanh doi)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (hang va)) hoi. hieu va cam xuc va ((thanh di) OR (thanh doi)) su triet*.