Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
thanh de » hanh de, thanh ve, thanh do
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua
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: ((thuat sach) or (su sach)) y nang cao hoi. hieu va cam ((xuc va) OR (luc va)) thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (su sach)) y nang cao hoi. hieu va cam ((xuc va) OR (luc va)) thanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (su sach)) y nang cao hoi. hieu va cam ((xuc va) OR (luc va)) thanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (su sach)) y nang cao hoi. hieu va cam ((xuc va) OR (luc va)) thanh de cua triet*.