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
nang ma » tang ma, sang ma, nang cao
sinh v » sinh va, sinh y
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
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 v) OR (sinh vat)) 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 v) OR (sinh vat)) nang ma hoi. hieu ((ve cam) OR (ve cac)) truc ban thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sinh v) OR (sinh vat)) 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 v) OR (sinh vat)) nang ma hoi. hieu ((ve cam) or (ve cac)) truc ban thanh vi cua viet*.