Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
dinh hai » dinh thai, tinh hai, dinh ha
tu sach » thu sach, te sach, tu cach
hai cua » thai cua, dai cua, hoi cua
va dinh » van dinh, va kinh, va tinh
cac lao » ca lao, cac loai, cac giao
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
lao va » tao va, cao va, bao va

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 (su sach)) ky nang xa hoi. ((hieu vien) or (thieu nien)) cac lao va dinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu vien) OR (thieu nien)) cac lao va dinh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. ((hieu vien) or (thieu nien)) cac lao va dinh hai cua tre*.