Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
thanh de » hanh de, thanh ve, thanh do
cham cuu » cap cuu, chat cua
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach v » sach va, sach y, sach 2
ha cuu » ho cuu, khao cuu
de cua » le cua, te cua, dieu cua

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 v ((nang xa) or (nang ma)) hoi. hieu van ((ha cuu) OR (cham cuu)) van thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang xa) OR (nang ma)) hoi. hieu van ((ha cuu) OR (cham cuu)) van thanh de cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v ((nang xa) or (nang ma)) hoi. hieu van ((ha cuu) OR (cham cuu)) van thanh de cua triet*".