Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
duc ban » duc tan, duc van, dua ban
nang xa » nang x, nang ma, mang xa
benh vi » benh va, benh ve, kenh vi
benh li » benh ly, benh lo, benh noi
cam duc » cam xuc, cao duc, pham duc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((benh vi) or (benh li)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((benh vi) OR (benh li)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((benh vi) or (benh li)) va triet*".