Perhaps you should try some spelling variations:
qua triet » cua triet, qua trinh, qua tieu
danh cau » danh dau, danh ca, danh hau
hieu van » hieu va, thien van, lieu va
van chat » cao chat
sach ky » sac ky, sach y, sach ty
duoc va » nuoc va, duc va, duoc ma
nang xa » lang xa, nang ma, mang xa
tu sach » thu sach, su sach, te sach
doc va » hoc va, duc va, loc va

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 ky ((nang xa) or (nang x)) hoi. hieu van chat ((doc va) OR (duoc va)) danh cau qua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu van chat ((doc va) OR (duoc va)) danh cau qua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang x)) hoi. hieu van chat ((doc va) OR (duoc va)) danh cau qua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang x)) hoi. hieu van chat ((doc va) OR (duoc va)) danh cau qua triet*.