Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham truc » cau truc, nham thuc, pham thuc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
truc ban » thuc ban, truc dan, truc van
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua vat
so sanh » do sanh
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (cho sinh)) y tang ma hoi. hieu van cham truc ban thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (cho sinh)) y tang ma hoi. hieu van cham truc ban thanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (cho sinh)) y tang ma hoi. hieu van cham truc ban thanh vi cua viet*.