Perhaps you should try some spelling variations:
khien canh » thien chanh, hien hanh, bien canh
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 canh ((xu may) or (xe may)) trinh vat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. dieu khien canh ((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 canh ((xu may) or (xe may)) trinh vat cuu tre*.