Perhaps you should try some spelling variations:
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
tai hai » dai hai, tai ha, tai phan
sach ky » sac ky, sach y, sach kem
thi hai » thi mai, thi hanh
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
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: su ((sach ky) OR (sach ty)) sang ((tai hai) or (thi hai)). hieu ve cac tuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) sang ((tai hai) OR (thi hai)). hieu ve cac tuc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) sang ((tai hai) or (thi hai)). hieu ve cac tuc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) sang ((tai hai) or (thi hai)). hieu ve cac tuc va hanh vi cua te*.