Perhaps you should try some spelling variations:
khien thach » khien thich, thien thanh, thien hach
thach duc » thach thuc, than duc, thinh duc
hay trinh » hanh trinh, may tinh, lap trinh
trinh vat » trinh van, trinh luat, sinh vat
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
duc hay » duc hau, duc ha, duc hai
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
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: thu sach ky nang x hoi. dieu khien thach duc hay trinh vat ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. dieu khien thach duc hay trinh vat ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. dieu khien thach duc hay trinh vat ((cuu tre) or (cua tre))*.