Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
duc tuan » duc thuan, duc tan, duc toan
va triet » va thiet, va trien, ve triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
sach ky » sac ky, sach y, sach ty
va cao » va cac, va co, va dao
anh vi » hanh vi, anh va, anh ve
cua tu » cua tuc, cua su, cua cu

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 lang xa hoi. hieu va cao duc tuan anh vi ((((cua te) or (cua tu))) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu va cao duc tuan anh vi ((((cua te) OR (cua tu))) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu va cao duc tuan anh vi ((((cua te) or (cua tu))) or (va triet))*.