Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
qua cam » qua cham, qua cac, qua ca
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
di cua » dai cua, doi cua, de cua

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

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