Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh dau » dinh dat, dinh du, danh dau
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dau cua » dai cua, day cua, cau cua
y tang » 6 tang, 7 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
luc va » tuc va, loc 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 ve cham ((luc va) OR (duc va)) dinh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (ky tang)) ma hoi. hieu ve cham ((luc va) OR (duc va)) dinh dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (ky tang)) ma hoi. hieu ve cham ((luc va) OR (duc va)) dinh dau cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (ky tang)) ma hoi. hieu ve cham ((luc va) OR (duc va)) dinh dau cua triet*.