Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
van manh » van minh, van anh, van hanh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
ve nam » he nam, va nam, le nam
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 y nang x hoi. hieu ve nam thuc ((van manh) or (hoang minh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ve nam thuc ((van manh) OR (hoang minh)) vai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ve nam thuc ((van manh) or (hoang minh)) vai cua viet*.