Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, nam truc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
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: su sach y nang x hoi. hieu ve ((((cam tuc) OR (dam thuc))) or (cam xuc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve ((((cam tuc) OR (dam thuc))) OR (cam xuc)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ve ((((cam tuc) OR (dam thuc))) or (cam xuc)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu ve ((((cam tuc) OR (dam thuc))) or (cam xuc)) va hanh vi cua tre*.