Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
vu sach » vu bach, su sach, vu khach
tuc van » thuc van, truc van, tuc va
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
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: vu sach ((ky tang) OR (ky dang)) ma hoi. hieu ve cam ((tuc van) or (thuc dan)) anh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky tang) OR (ky dang)) ma hoi. hieu ve cam ((tuc van) OR (thuc dan)) anh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky tang) OR (ky dang)) ma hoi. hieu ve cam ((tuc van) or (thuc dan)) anh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky tang) OR (ky dang)) ma hoi. hieu ve cam ((tuc van) or (thuc dan)) anh vi hoa viet*.