Perhaps you should try some spelling variations:
hoc viet » hoc hien
xang may » mang may, bang may, xang dau
thanh vi » hanh vi, thanh va, thanh ve
thuc van » thuc vat, thuc dan, thuc hanh
thuc va » thuc vat, thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
may hoi » may thoi, tay hoi, mai hoi
ve cam » ve cham, ve cac, ve cai
vi hoc » li hoc, va hoc
va cam » va cham, va cac, va cao

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 ty xang may hoi. hieu ((ve cam) or (va cam)) ((thuc van) or (thuc va)) thanh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty xang may hoi. hieu ((ve cam) OR (va cam)) ((thuc van) OR (thuc va)) thanh vi hoc viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty xang may hoi. hieu ((ve cam) or (va cam)) ((thuc van) or (thuc va)) thanh vi hoc viet*.