Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dang xay » dang van, van xay
cham xuc » cam xuc, chat xuc, cham soc
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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) or (tu sach)) ky ((nang xa) or (dang xay)) hoi. hieu vu cham xuc va dinh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (tu sach)) ky ((nang xa) OR (dang xay)) hoi. hieu vu cham xuc va dinh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (tu sach)) ky ((nang xa) or (dang xay)) hoi. hieu vu cham xuc va dinh vi cua viet*.