Perhaps you should try some spelling variations:
ban hanh » ban hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
cua tuc » cua tu, cua thuoc, luat tuc
cua duc » cua nuoc, cua quoc
sach v » sach va, sach 2, sach vay
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: te ((sach v) or (sach y)) nang ma hoa. hieu ve cac cuc ban hanh vi ((cua tuc) OR (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang ma hoa. hieu ve cac cuc ban hanh vi ((cua tuc) OR (cua duc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang ma hoa. hieu ve cac cuc ban hanh vi ((cua tuc) OR (cua duc))".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang ma hoa. hieu ve cac cuc ban hanh vi ((cua tuc) OR (cua duc))*.