Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac giac » cac giai, cac giao, canh giac
ha triet » nha triet, hanh triet, khac triet
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac gia » cac giai, cac giao, tac gia
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang xa hoi. lieu va nam ((cac gia) or (cac giac)) thanh pho ((ha triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. lieu va nam ((cac gia) OR (cac giac)) thanh pho ((ha triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang xa hoi. lieu va nam ((cac gia) or (cac giac)) thanh pho ((ha triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. lieu va nam ((cac gia) or (cac giac)) thanh pho ((ha triet) OR (va triet))*.