Perhaps you should try some spelling variations:
te sach » toc sach
hanh di » hanh de, hang di, danh di
cac duc » cac du, cao duc, cac dac
sach lo » sach dao, sach doi, sach hoi
hieu ve » hieu va, hieu van
tang ma » tang van
cua tuc » cua duc, cua tu, cua thuoc
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 lo ((mang may) or (tang ma)) hoi. hieu ve cac duc tan ((hanh di) OR (hanh vi)) cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo ((mang may) OR (tang ma)) hoi. hieu ve cac duc tan ((hanh di) OR (hanh vi)) cua tuc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo ((mang may) or (tang ma)) hoi. hieu ve cac duc tan ((hanh di) OR (hanh vi)) cua tuc*".