Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham loc » cham soc, chon loc, cham o
danh dau » lanh dao, hang dau, danh tu
va triet » va thiet, va trien, ve triet
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
va danh » va dinh, va dan, va hanh
y tang » 6 tang, 7 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
dau va » dau ve, lau va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y tang) or (ky tang)) ma hoi. hieu van cham loc va danh dau va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (ky tang)) ma hoi. hieu van cham loc va danh dau va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (ky tang)) ma hoi. hieu van cham loc va danh dau va triet*.