Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
truc ban » thuc ban, truc dan, truc van
so sinh » so sanh, cho sinh, hoa sinh
so tinh » o tinh, so tin, hoi tinh
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
ve cam » ve cham, va cam, ve cai

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

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