Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh hai » thanh phan, thanh hoa, thanh san
ve chinh » te chinh, va chinh, che chinh
thuc day » thuc dan, thuc vat
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
va cham » va chat, va tham
hai va » hai van, thai va, hoi 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 dang xa hoi. hieu ((ve chinh) or (va cham)) thuc day thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ((ve chinh) OR (va cham)) thuc day thanh hai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ((ve chinh) or (va cham)) thuc day thanh hai va triet*.