Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
va cua » va chua, via cua, ca 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 nang ma hoa. hieu ((van cau) or (van hau)) dat va tinh va cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu ((van cau) OR (van hau)) dat va tinh va cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu ((van cau) or (van hau)) dat va tinh va cua vat*.