Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu phan » phieu phan, lieu phan, hieu pham
van hanh » van thanh, ban hanh, van anh
dat luan » dan luan, dau luan, dat quang
phan dat » phan dau, phan dai, phan day
lang van » dang van, tang van, hoang van
lang xa » lang ha, dang xay
thu tai » tu tai, tru tai, thu hai
thu sai » thu hai, thu san, thu ai
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sai) or (thu tai)) ky ((lang xa) OR (lang van)) hoi. hieu phan dat luan van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sai) OR (thu tai)) ky ((lang xa) OR (lang van)) hoi. hieu phan dat luan van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sai) or (thu tai)) ky ((lang xa) OR (lang van)) hoi. hieu phan dat luan van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sai) or (thu tai)) ky ((lang xa) OR (lang van)) hoi. hieu phan dat luan van hanh vi cua triet*.