Perhaps you should try some spelling variations:
chua viet » chuan viet, cua viet, chu viet
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
va chua » vua chua, ca chua, va chu
danh va » doanh va, hanh va, anh va
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
te sach » toc sach
x hoi » xa hoi, o hoi, x ho
ve am » va am

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 (te sach)) ky nang x hoi. hieu ve am ((thuc va) OR (thuc day)) danh va chua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. hieu ve am ((thuc va) OR (thuc day)) danh va chua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x hoi. hieu ve am ((thuc va) OR (thuc day)) danh va chua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. hieu ve am ((thuc va) OR (thuc day)) danh va chua viet*.