Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
van chat » cao chat
day danh » day manh, dai danh, dao danh
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
day cua » dai cua
dau cua » dai cua, cau cua, dan cua
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van chat thuc day danh ((dau cua) or (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van chat thuc day danh ((dau cua) OR (day cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu van chat thuc day danh ((dau cua) or (day cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van chat thuc day danh ((dau cua) or (day cua)) tre*.