Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec bach » vien bach, viec ban, viec bao
tuoc gia » quoc gia, luoc gia, tuc gia
cua tre » cua te, cuu tre, cua triet
hanh va » hanh vi
nang ma » tang ma, sang ma, nang cao
toc gia » toc giay, tac gia, quoc gia
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ma hoa. nhieu viec bach ((tuoc gia) or (toc gia)) ((hanh va) OR (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoa. nhieu viec bach ((tuoc gia) OR (toc gia)) ((hanh va) OR (hang va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoa. nhieu viec bach ((tuoc gia) or (toc gia)) ((hanh va) OR (hang va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoa. nhieu viec bach ((tuoc gia) or (toc gia)) ((hanh va) OR (hang va)) cua tre*.