Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cac lao » ca lao, cac loai, cac giao
va danh » va dinh, va dan, va hanh
vai cua » hai cua, lai cua, bai cua
lao va » tao va, cao va, bao va
x hoi » xa hoi, o hoi, x ho

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) or (su sach)) ky nang x hoi. hieu viec cac lao va danh ((vai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu viec cac lao va danh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu viec cac lao va danh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu viec cac lao va danh ((vai cua) OR (dai cua)) tre*.