Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
vu khach » vu khanh, vu khac, vay khach
dinh doi » dinh moi, tinh doi, dinh toi
vu sach » vu bach, su sach
doi cua » dai cua, hoi cua
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
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: ((vu sach) or (vu khach)) ky nang ma hoi. ((hieu viec) or (hieu ve)) sach nuoc va dinh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang ma hoi. ((hieu viec) OR (hieu ve)) sach nuoc va dinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ky nang ma hoi. ((hieu viec) or (hieu ve)) sach nuoc va dinh doi cua tre*.