Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
cua triet » cua viet, su triet, va triet
nuoc van » nuoc va, nuoc san, luoc van
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
doi cua » dai cua, hoi cua
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: so sach ky nang ma hoi. ((hieu viec) OR (nhieu viec)) sach nuoc van hanh doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ma hoi. ((hieu viec) OR (nhieu viec)) sach nuoc van hanh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. ((hieu viec) OR (nhieu viec)) sach nuoc van hanh doi cua triet*.