Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nam thuc » nam thuoc, am thuc, nam thu
hieu he » hieu ve, hiem he, hieu le
va hanh » va thanh, va danh, dao hanh
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
hai cua » thai cua, dai cua, hoi cua
he nam » ha nam, nghe nam
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ha hoi. hieu he nam thuc ((va hanh) or (((van hanh) OR (ban hanh)))) hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. hieu he nam thuc ((va hanh) OR (((van hanh) OR (ban hanh)))) hai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ha hoi. hieu he nam thuc ((va hanh) or (((van hanh) OR (ban hanh)))) hai cua viet".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. hieu he nam thuc ((va hanh) or (((van hanh) OR (ban hanh)))) hai cua viet*.