Perhaps you should try some spelling variations:
thuc dan » thuc hanh, thuc vat
manh vai » manh hai, manh va, manh khai
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve nam » he nam, le nam, te nam
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. hieu ((ve nam) or (va nam)) ((thuc dan) OR (hoc dan)) manh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu ((ve nam) OR (va nam)) ((thuc dan) OR (hoc dan)) manh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu ((ve nam) or (va nam)) ((thuc dan) OR (hoc dan)) manh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu ((ve nam) or (va nam)) ((thuc dan) OR (hoc dan)) manh vai cua viet*.