Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cap phoi » cap cho
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
ky dang » ky danh
cam tuc » cam xuc, cam tu, nam thuc
hanh va » hang va
van cam » van nam, van lam, van cau
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: thu sach ((ky dang) or (ky nang)) cap phoi. 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: thu sach ((ky dang) OR (ky nang)) cap phoi. 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: "thu sach ((ky dang) or (ky nang)) cap phoi. hieu van cam tuc va ((hanh va) OR (hanh vi)) su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky dang) or (ky nang)) cap phoi. hieu van cam tuc va ((hanh va) OR (hanh vi)) su triet*.