Perhaps you should try some spelling variations:
chai duc » pham duc, phan duc, cao duc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va chai » va cai, va chat, va cham
duc gia » quoc gia
doi cua » dai cua, hoi cua
vi cua » vai cua
di cua » dai cua, de cua, do 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. lieu va chai duc gia thanh ((vi cua) or (((di cua) OR (doi cua)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. lieu va chai duc gia thanh ((vi cua) OR (((di cua) OR (doi cua)))) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. lieu va chai duc gia thanh ((vi cua) or (((di cua) OR (doi cua)))) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. lieu va chai duc gia thanh ((vi cua) or (((di cua) OR (doi cua)))) tre*.