Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua viet » ca viet, hoa viet, cua vat
day manh » van manh, duc manh, ha manh
day danh » dai danh, dao danh, day dan
sai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, tu cach
hieu tu » chieu tu, hieu tuc, hien tu
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
tu pham » thu pham, su pham, tu phat
ma hoi » mai hoi, xa hoi, ma hoa

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) or (te sach)) ky nang ma hoi. hieu tu pham thuc ((day danh) OR (day manh)) sai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ma hoi. hieu tu pham thuc ((day danh) OR (day manh)) sai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ma hoi. hieu tu pham thuc ((day danh) OR (day manh)) sai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ma hoi. hieu tu pham thuc ((day danh) OR (day manh)) sai cua viet*.