Perhaps you should try some spelling variations:
viec nhom » viec cho, viec khoa
hieu viec » nhieu viec, hieu ve, sieu viet
nhom xu » nhoi xu, nhom su
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, van nang
y nang » ky nang, ly nang, may nang
xu cam » xuc cam, tu cam
dan va » dan ca, ban va, han 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: su sach ((y nang) or (v nang)) x hoi. hieu viec nhom xu cam ((dan va) OR (doan va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) x hoi. hieu viec nhom xu cam ((dan va) OR (doan va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) x hoi. hieu viec nhom xu cam ((dan va) OR (doan va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) x hoi. hieu viec nhom xu cam ((dan va) OR (doan va)) cuu tre*.