Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va cao » va cac, va co, va dao
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x hoi) or (xa hoi)). hieu va cao suc manh thanh va ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (xa hoi)). hieu va cao suc manh thanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) or (xa hoi)). hieu va cao suc manh thanh va ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (xa hoi)). hieu va cao suc manh thanh va ((cua tre) OR (cuu tre))*.