Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
cac loai » cac bai, cac giai, cac dai
thu sach » thuat sach, thuoc sach, thu hoach
van cua » vang cua, ban cua, dan cua
va dinh » van dinh, va kinh, va tinh
tu sach » su sach, te sach, tu cach
cac lao » ca lao, cac giao, cac lang
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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