Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
qua nam » quan nam, cua nam, quang nam
va tinh » may tinh
cua tre » cua te, cuu tre, 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: te sach ky nang ma hoi. hieu qua nam thuc ((va tinh) or (gia thanh)) hoi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu qua nam thuc ((va tinh) OR (gia thanh)) hoi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu qua nam thuc ((va tinh) or (gia thanh)) hoi ((cua tre) or (cua triet))*.