Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan
manh vai » manh hai, manh va, manh khai
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va viet » hoa viet, san viet, mai viet
ve nam » he nam, va nam, le nam
vai va » mai va, dai va, hai va
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: thu sach ky nang x hoi. hieu ve nam ((thuc dan) or (thuc vat)) manh vai va viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ve nam ((thuc dan) OR (thuc vat)) manh vai va viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ve nam ((thuc dan) or (thuc vat)) manh vai va viet*.