Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
lap cua » lai cua, tap cua, lam cua
cau day » cau xay, cam day, cau may
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu van cau day va thanh lap cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach y)) ((nang xa) OR (nang ma)) hoi. hieu van cau day va thanh lap cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu van cau day va thanh lap cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu van cau day va thanh lap cua triet*.