Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nuoc ban » nuoc san, quoc ban, buoc ban
tu sach » thu sach, su sach, te sach
ly nang » ly hang, ly vang, ly quang
ban anh » ban hanh, ban banh, ban danh
lai cua » dai cua, hai cua, lai chau
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: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac nuoc ban anh ((vi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac nuoc ban anh ((vi cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac nuoc ban anh ((vi cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac nuoc ban anh ((vi cua) or (lai cua)) tre*.