Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va
loc va » hoc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) hanh vi ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) hanh vi ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) hanh vi ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu ve cam ((luc va) OR (loc va)) hanh vi ((cua te) or (va triet))*.