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

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 van 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 van 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 van tham xuc dat khanh vi ((cua tre) or (cua viet))*.