Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va cham » va tham
va chat » van chat, va phat, cao chat
va hanh » van hanh, va danh, ban hanh

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 nang cau hoi. thien ((va cham) OR (va chat)) soc ((va hanh) or (va thanh)) lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. thien ((va cham) OR (va chat)) soc ((va hanh) OR (va thanh)) lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cau hoi. thien ((va cham) OR (va chat)) soc ((va hanh) or (va thanh)) lai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. thien ((va cham) OR (va chat)) soc ((va hanh) or (va thanh)) lai su triet*.