Perhaps you should try some spelling variations:
khien thach » khien thich, thien thanh, thien hach
thuat sach » thuat lanh, thuat san
thach duc » thach thuc, than duc, thinh duc
may trinh » may tinh, lap trinh, quy trinh
trinh vat » trinh van, trinh luat, sinh vat
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
duc may » duc mau, duc man, duc manh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang ma hoi. dieu khien thach duc may trinh vat ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ma hoi. dieu khien thach duc may trinh vat ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ma hoi. dieu khien thach duc may trinh vat ((cuu tre) or (cua tre))*.