Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
van tham » van thanh, van tuan, van chat
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
va cham » va chat, va tham
va hanh » va thanh, va danh, ban hanh
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang cau hoi. thien ((va cham) or (van tham)) soc ((va hanh) OR (van hanh)) lai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cau hoi. thien ((va cham) OR (van tham)) soc ((va hanh) OR (van hanh)) lai su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cau hoi. thien ((va cham) or (van tham)) soc ((va hanh) OR (van hanh)) lai su tien".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cau hoi. thien ((va cham) or (van tham)) soc ((va hanh) OR (van hanh)) lai su tien*.