Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac dat » cac dan, cac dai, cac dac
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. hieu van ((((cac dat) or (cai dat))) or (cac bai)) van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu van ((((cac dat) OR (cai dat))) OR (cac bai)) van hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu van ((((cac dat) or (cai dat))) or (cac bai)) van hanh vi cua vat*.