Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
thuc day » thuc dan
kien cua » khien cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
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: doc sach ky nang ma hoi. hieu va cham ((thuc day) or (thuc vat)) danh kien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang ma hoi. hieu va cham ((thuc day) OR (thuc vat)) danh kien cua triet.
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang ma hoi. hieu va cham ((thuc day) or (thuc vat)) danh kien cua triet*.