Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
hang dau » hang va, hang tai
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
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
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 (doc sach)) ly hang dau hoi. hieu va cam ((thuc va) or (duc va)) danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ly hang dau hoi. hieu va cam ((thuc va) OR (duc va)) danh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ly hang dau hoi. hieu va cam ((thuc va) or (duc va)) danh vi cua triet*.