Perhaps you should try some spelling variations:
cua triet » su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
danh tu » anh tu, doanh thu
tang xa » trang xa, tang ma, lang xa
loc va » hoc va
y tang » ky tang, 6 tang, 7 tang
luc va » duc va, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y tang xa hoi. hieu ve cham ((loc va) OR (luc va)) danh tu ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang xa hoi. hieu ve cham ((loc va) OR (luc va)) danh tu ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y tang xa hoi. hieu ve cham ((loc va) OR (luc va)) danh tu ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: toc sach y tang xa hoi. hieu ve cham ((loc va) OR (luc va)) danh tu ((cua triet) or (cua viet))*.