Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
sach duoc » sach nuoc, sach dao, sach dung
cua triet » cua viet, su triet, va triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va xanh » va danh, va hanh, va anh
xanh di » danh di, vanh dai, xanh tai
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 ((sach duoc) or (cac nuoc)) va xanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu viec ((sach duoc) OR (cac nuoc)) va xanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu viec ((sach duoc) or (cac nuoc)) va xanh di cua triet*.