Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sanh ky » hanh ky, sang ky, nganh ky
vai cua » dai cua, hai cua, lai cua
tru ban » truc ban, thu ban, tu ban
cac tru » ca tru, cac tro, cac thu
so sanh » do sanh
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac

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 ky ((nang ma) OR (sang ma)) hoi. hieu ve cac tru ban thanh ((di cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((nang ma) OR (sang ma)) hoi. hieu ve cac tru ban thanh ((di cua) OR (vai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky ((nang ma) OR (sang ma)) hoi. hieu ve cac tru ban thanh ((di cua) or (vai cua)) triet*".