Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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 hanh de ((cua triet) OR (cua viet))~.
• 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 hanh de ((cua triet) OR (cua viet)).
• 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 hanh de ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (su sach)) y nang cao hoi. hieu va cam xuc va hanh de ((cua triet) OR (cua viet))*.