Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cach dua » cach cua, cach dung, cac du
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac duy » cac du, cac quy
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu ve ((cac duy) OR (cach dua)) van minh ((vai cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu ve ((cac duy) OR (cach dua)) van minh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu ve ((cac duy) OR (cach dua)) van minh ((vai cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu ve ((cac duy) OR (cach dua)) van minh ((vai cua) or (dai cua)) te*.