Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
bac dat » bac dai, ban dat, bac dan
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
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) or (tu sach)) ky nang xa hoi. hieu van bac dat va danh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (tu sach)) ky nang xa hoi. hieu van bac dat va danh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (tu sach)) ky nang xa hoi. hieu van bac dat va danh vi cua vat*.