Perhaps you should try some spelling variations:
trinh ve » trinh he, trinh va, trinh vi
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va dao
xuc va » tuc va, luc va, xac va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va cao ((xuc va) OR (duc va)) trinh ve ((cua te) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu va cao ((xuc va) OR (duc va)) trinh ve ((cua te) or (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va cao ((xuc va) OR (duc va)) trinh ve ((cua te) or (cau tren))*.