Perhaps you should try some spelling variations:
thien van » thi van
dan thanh » dang thanh, danh thanh, ban thanh
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
cac thuc » cach thuc, cac thu, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
ky lang » ky dang, ky tang, tay lang
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, dua tren
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky nang)) xa hoi. thien van cac thuc dan thanh vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky nang)) xa hoi. thien van cac thuc dan thanh vai ((cua tre) OR (cua triet))*.