Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
cham duc » cham soc, pham duy, phan duc
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
doi va » hoi va, noi 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 ty nang x ho. hieu ve ((cham duc) or (pham duc)) va danh doi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. hieu ve ((cham duc) OR (pham duc)) va danh doi va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. hieu ve ((cham duc) or (pham duc)) va danh doi va triet*.