Perhaps you should try some spelling variations:
su sach » vu sach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ve coc » ve cuoc, ve cac, ve co
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky ((nang ma) OR (nang cao)) hoi. hieu ve coc luc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky ((nang ma) OR (nang cao)) hoi. hieu ve coc luc va tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky ((nang ma) OR (nang cao)) hoi. hieu ve coc luc va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky ((nang ma) OR (nang cao)) hoi. hieu ve coc luc va tinh di cua tre*.