Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dieu hien » dieu khien, dieu kien, bieu hien
hien cac » thien cac, vien cac, hieu cac
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
cac tao » cau tao, cac tro, cac tac
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
cua tre » cua te, cuu tre, dua tren

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 xa) OR (nang ma)) hoi. dieu hien cac tao va dinh va ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang ma)) hoi. dieu hien cac tao va dinh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (nang ma)) hoi. dieu hien cac tao va dinh va ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (nang ma)) hoi. dieu hien cac tao va dinh va ((cua tre) or (cua triet))*.