Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu viec » nhieu viec, sieu viet, hieu hien
dua tren » dung tren
danh hoi » danh hoa, dan hoi, danh hoc
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh hoi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. ((hieu viec) OR (hieu ve)) sach nuoc va danh hoi ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va danh hoi ((dua tren) or (cuu tre))*.