Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hang dau » hang va, hang tai
danh vi » hanh vi, dinh vi, danh di
dau hoi » cau hoi, dai hoi, dan hoi
ly hang » ly quang
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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: ((te sach) OR (toc sach)) ly hang dau hoi. hieu va cam ((tuc va) or (duc va)) danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly hang dau hoi. hieu va cam ((tuc va) OR (duc va)) danh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly hang dau hoi. hieu va cam ((tuc va) or (duc va)) danh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ly hang dau hoi. hieu va cam ((tuc va) or (duc va)) danh vi cua triet*.