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