Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
hang tai » hang va, dung tai
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, tu cach
tai hai » thi hai, dai hai, tai ha
ly hang » ly quang
te sach » toc sach
hieu ve » hieu va, hieu van
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: ((tu sach) or (te sach)) ly hang tai hai. hieu ve ((tham thuc) OR (pham thuc)) va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly hang tai hai. hieu ve ((tham thuc) OR (pham thuc)) va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ly hang tai hai. hieu ve ((tham thuc) OR (pham thuc)) va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ly hang tai hai. hieu ve ((tham thuc) OR (pham thuc)) va hanh vi cua triet*.