Perhaps you should try some spelling variations:
may thoi » gay thoi, may thi, tay thoi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
thuc va » thuc dan, thuc day
y mang » cay mang
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: su sach y mang may thoi. hieu ve cam ((thuc va) or (thuc vat)) anh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y mang may thoi. hieu ve cam ((thuc va) OR (thuc vat)) anh vi hoa viet*.