Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dinh tai » dinh toai, dinh tri, dinh thi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
va dinh » van dinh, va kinh, va tinh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang

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) OR (ky nang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) va dinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hieu ve ((cam tuc) OR (nam thuc)) va dinh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) va dinh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) va dinh tai cua tre*.