Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
sach lo » sach dao, sach doi, sach hoi
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
hieu ve » hieu van
te sach » toc sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cua tuc » cua duc, cua tu, cua thuoc
vi cua » vai cua, di cua

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 ((nang ma) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cac duc tan hanh vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo ((nang ma) OR (tang ma)) hoi. ((hieu ve) OR (hieu va)) cac duc tan hanh vi cua tuc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo ((nang ma) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cac duc tan hanh vi cua tuc*".