Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac loai » cac bai, cac giai, cac toi
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac dai » cac dan, cac bai, can dai
via cua » gia cua, gian cua, giau cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ve ((cac loai) OR (cac dai)) tuan anh ((via cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve ((cac loai) OR (cac dai)) tuan anh ((via cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve ((cac loai) OR (cac dai)) tuan anh ((via cua) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve ((cac loai) OR (cac dai)) tuan anh ((via cua) or (ca cua)) tre*.