Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dinh vai » dinh van, dinh vi, dinh va
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
cac lop » cac hop, cac loai
cua te » cua tu
cac lo » cac co, cac bo, cac 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 ky nang xa hoi. hieu hien ((cac lo) or (cac lop)) va dinh vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu hien ((cac lo) OR (cac lop)) va dinh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu hien ((cac lo) or (cac lop)) va dinh vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu hien ((cac lo) or (cac lop)) va dinh vai ((cua tre) OR (cua te))*.