Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
di cau » da cau, diem cau

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 _ lang ((mai hoi) or (dai hoc)). hieu ((ve cac) or (ve cham)) xuc va hanh di cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ lang ((mai hoi) OR (dai hoc)). hieu ((ve cac) OR (ve cham)) xuc va hanh di cau triet.
• Adding a wildcard symbol may retrieve word variants: tu sach _ lang ((mai hoi) or (dai hoc)). hieu ((ve cac) or (ve cham)) xuc va hanh di cau triet*.