Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham loc » cham soc, chon loc, cham o
danh dau » lanh dao, hang dau, danh tu
danh day » dan day, doanh dao, lanh dao
te sach » toc sach
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ve cham » va cham, ve chat, vu cham
y tang » ky tang, 6 tang, 5 tang
loc va » hoc va, luc va
7 tang » 6 tang

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 (7 tang)) van hoi. hieu ve cham loc va ((danh day) or (danh dau)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (7 tang)) van hoi. hieu ve cham loc va ((danh day) OR (danh dau)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) OR (7 tang)) van hoi. hieu ve cham loc va ((danh day) or (danh dau)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) OR (7 tang)) van hoi. hieu ve cham loc va ((danh day) or (danh dau)) cua triet*.