Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
ky lang » ky nang, ky dang, ky tang
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
hanh va » hang va
tuc va » thuc va, truc va, tuc xa

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

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