Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, cham soc
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang x hoi. hieu ve ((cham tuc) OR (tham thuc)) va ((dinh tri) or (chinh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu ve ((cham tuc) OR (tham thuc)) va ((dinh tri) OR (chinh tri)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu ve ((cham tuc) OR (tham thuc)) va ((dinh tri) or (chinh tri)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu ve ((cham tuc) OR (tham thuc)) va ((dinh tri) or (chinh tri)) cua tre*.