Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
tang mai » tang ma, tang tai, lang mai
danh dau » lanh dao, hang dau, danh tu
te sach » toc sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y tang » ky tang, 6 tang, 7 tang
loc va » luc 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 mai hoi. hieu ve cham ((loc va) OR (hoc va)) danh dau ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang mai hoi. hieu ve cham ((loc va) OR (hoc va)) danh dau ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang mai hoi. hieu ve cham ((loc va) OR (hoc va)) danh dau ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: te sach y tang mai hoi. hieu ve cham ((loc va) OR (hoc va)) danh dau ((cua triet) or (cua viet))*.