Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
van cham » van chat, va cham, van pham
van tham » van thanh, van tuan, van chat
hanh lai » hanh lam, hanh tai, thanh lap
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
soc va » hoc va, loc va, doc va
lai va » loai va, mai va, dai va

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 ((van cham) or (van tham)) soc va hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. thien ((van cham) OR (van tham)) soc va hanh lai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. thien ((van cham) or (van tham)) soc va hanh lai va triet*.