Perhaps you should try some spelling variations:
thuc van » thuc dan, thuc va, thuc hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
ma hoi » mai hoi, xa hoi, me hoi
anh vi » hanh vi, anh va, anh ve
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang ((ma hoi) or (ma hoa)). hieu ve chat ((thuc van) or (thuc vat)) anh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((ma hoi) OR (ma hoa)). hieu ve chat ((thuc van) OR (thuc vat)) anh vi hoa viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((ma hoi) or (ma hoa)). hieu ve chat ((thuc van) or (thuc vat)) anh vi hoa viet*.