Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
dat cua » dai cua, day cua, mat cua
y nang » ky nang, ly nang, v nang
dau va » dau ve, lau va
ma hoi » mai hoi, xa hoi, ma hoa
du va » tu va, su va, vu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. ((hieu ve) OR (hieu van)) cac ((du va) OR (dau va)) thanh dat cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. ((hieu ve) or (hieu van)) cac ((du va) OR (dau va)) thanh dat cua triet~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. ((hieu ve) or (hieu van)) cac ((du va) OR (dau va)) thanh dat cua triet*.