Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va cam » va cac, va cao, va cai
xuc va » duc va, tuc va, luc va
di su » doi su, ki su, da su

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) OR (va cham)) xuc va thanh di 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) OR (va cham)) xuc va thanh di 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) OR (va cham)) xuc va thanh di su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (hang va)) hoi. hieu ((va cam) OR (va cham)) xuc va thanh di su triet*.