Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 (co sach)) ky nang x hoi. hieu ve pham thuc va tinh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang x hoi. hieu ve pham thuc va tinh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang x hoi. hieu ve pham thuc va tinh vi cua vat*.