Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
xanh dien » danh dien, nganh dien, nhanh dien
van nhan » van phan, van thanh, danh nhan
thuc day » thuc dan, thuc vat
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
xanh di » danh di, vanh dai, xanh tai
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet

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) or (tu sach)) ky nang xa hoi. hieu van nhan thuc day ((xanh di) or (xanh dien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu van nhan thuc day ((xanh di) OR (xanh dien)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang xa hoi. hieu van nhan thuc day ((xanh di) or (xanh dien)) cua tre*.