Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
vai cua » dai cua, hai cua, lai cua
va kinh » va tinh, qua kinh
va dinh » van dinh, va tinh, vu dinh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
cac bo » bac bo, cac co

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 ty nang xa hoi. ((hieu hien) or (chieu chien)) cac bo ((va dinh) OR (va kinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu hien) OR (chieu chien)) cac bo ((va dinh) OR (va kinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu hien) or (chieu chien)) cac bo ((va dinh) OR (va kinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu hien) or (chieu chien)) cac bo ((va dinh) OR (va kinh)) vai cua tre*.