Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
cac lop » cac hop, cac loai
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
cac lo » cac co, cac bo, cac 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 (thu sach)) ky nang xa hoi. nhieu viec ((cac lo) or (cac lop)) va dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. nhieu viec ((cac lo) OR (cac lop)) va dan vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. nhieu viec ((cac lo) or (cac lop)) va dan vai cua tre*.