Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
vu nang » vuc nang, va nang, vu dang
cua tre » cua te, cuu tre, dua tren
hieu va » lieu va, hieu qua
v nang » va nang, van nang, voi nang
cac lo » cac lop, cac co, cac bo
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
x hoi » xa hoi, o hoi, x ho
lo va » lo van, lao va, ly va

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 ((v nang) or (vu nang)) x hoi. hieu va cac lo va dan di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((v nang) OR (vu nang)) x hoi. hieu va cac lo va dan di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((v nang) or (vu nang)) x hoi. hieu va cac lo va dan di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((v nang) or (vu nang)) x hoi. hieu va cac lo va dan di ((cua tre) OR (cua triet))*.