Perhaps you should try some spelling variations:
khien cach » khien canh, thien hach, hien cac
trinh vat » trinh van, trinh luat, sinh vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vat cuu » vat cua
cuu tre » cua tre, cau tren, cau treo
xu may » tu may
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. dieu khien cach ((xu may) OR (xe may)) trinh vat cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. dieu khien cach ((xu may) OR (xe may)) trinh vat cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. dieu khien cach ((xu may) OR (xe may)) trinh vat cuu tre*.