Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
toc sach » hoc sach, doc sach, thuoc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
ky dang » ky nang, ky danh
hai cua » thai cua, dai cua, hoi cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang ((mai hoi) or (ma hoa)). hieu ve cam ((duc va) or (truc va)) hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang ((mai hoi) OR (ma hoa)). hieu ve cam ((duc va) OR (truc va)) hanh hai cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang ((mai hoi) or (ma hoa)). hieu ve cam ((duc va) or (truc va)) hanh hai cua triet*.