Perhaps you should try some spelling variations:
dat khanh » van khanh, duy khanh
cua viet » ca viet, hoa viet, cua vat
tham xuc » tham nuoc, tham thuc, pham duc
khanh vi » hanh vi, khanh v, nhanh vi
cua tre » cua te, cuu tre, cua triet
xuc dat » duc duat, duoc dat, quoc dat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
va tham » van tham, va cham, va thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu va tham xuc dat khanh vi ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu va tham xuc dat khanh vi ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (lang xa)) hoi. hieu va tham xuc dat khanh vi ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu va tham xuc dat khanh vi ((cua tre) or (cua viet))*.