Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
dinh doi » dinh moi, tinh doi, dinh toi
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. ((hieu viec) or (lieu va)) sach nuoc va dinh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu viec) OR (lieu va)) sach nuoc va dinh doi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu viec) or (lieu va)) sach nuoc va dinh doi cua triet*.