Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cac loai » cac bai, cac giai, cac dai
tu sach » thu sach, su sach, tu cach
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
cac lao » ca lao, cac giao, cac lang
nang xa » nang x, lang xa, nang ma
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang xa hoi. hieu hien ((cac lao) OR (cac loai)) va dinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. hieu hien ((cac lao) OR (cac loai)) va dinh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang xa hoi. hieu hien ((cac lao) OR (cac loai)) va dinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang xa hoi. hieu hien ((cac lao) OR (cac loai)) va dinh va cua tre*.