Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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 lang xa hoi. hieu van ((tham thuc) or (nhan thuc)) va ((danh vi) OR (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y lang xa hoi. hieu van ((tham thuc) OR (nhan thuc)) va ((danh vi) OR (dinh vi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y lang xa hoi. hieu van ((tham thuc) or (nhan thuc)) va ((danh vi) OR (dinh vi)) cua tre*".