Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
hanh van » thanh van, khanh van, hanh va
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
van lam » van nam
thuc va » thuc vat, thuc day
so sac » so sach, so dac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
hoa » khoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky dang ma hoi. hieu van lam ((tuc xa) or (((thuc va) or (thuc dan)))) hanh van hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dang ma hoi. hieu van lam ((tuc xa) OR (((thuc va) OR (thuc dan)))) hanh van hoa viet.
• Adding a wildcard symbol may retrieve word variants: so sac ky dang ma hoi. hieu van lam ((tuc xa) or (((thuc va) or (thuc dan)))) hanh van hoa viet*.