Perhaps you should try some spelling variations:
viet cua » viec cua, viet ca, viet qua
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
tieu su » thieu so
cham oc » cham soc, cham o, cham hoi
van anh » van thanh, tuan anh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu va) OR (tieu su)) cham oc ((van anh) OR (van minh)) viet cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu va) or (tieu su)) cham oc ((van anh) OR (van minh)) viet cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu va) or (tieu su)) cham oc ((van anh) OR (van minh)) viet cua viet*.