Perhaps you should try some spelling variations:
man tinh » may tinh, ban tinh, quan tinh
voi pham » vi pham, toi pham, loai pham
hieu voi » hieu moi, lieu voi, hieu loi
tu cach » tu cac
tinh de » tinh da, sinh de, tinh he
duc man » duc manh, duc tan, duc mau
cua tre » cua te, cuu tre, cua triet
van hoe » van hoc, van hieu, van hien
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
de cua » le cua, te cua, dieu 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 cach) or (so sach)) ky dang ((van hoe) or (van hoa)). hieu voi pham duc man tinh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky dang ((van hoe) OR (van hoa)). hieu voi pham duc man tinh de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky dang ((van hoe) or (van hoa)). hieu voi pham duc man tinh de cua tre*.