Perhaps you should try some spelling variations:
viec nhom » viec cho, viec khoa
nam danh » nam dinh, nam dan
dia danh » dia ban, gia dinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. ((hieu he) or (viec nhom)) nam thu ((dia danh) or (nam danh)) sai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu he) OR (viec nhom)) nam thu ((dia danh) OR (nam danh)) sai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. ((hieu he) or (viec nhom)) nam thu ((dia danh) or (nam danh)) sai cuu tre*.