Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tuc van » thuc van, truc van, tuc va
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
vi va » vi van, vai va, vu va

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 ((y lang) or (_ lang)) van hoa. hieu va cham tuc van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((y lang) OR (_ lang)) van hoa. hieu va cham tuc van hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: doc sach ((y lang) or (_ lang)) van hoa. hieu va cham tuc van hanh vi va triet*.