Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, me hoi
cua su » qua su

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 ty tang ((ma hoi) or (ma hoa)). hieu ve cac ((xuc van) OR (vuc van)) hanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty tang ((ma hoi) OR (ma hoa)). hieu ve cac ((xuc van) OR (vuc van)) hanh dai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty tang ((ma hoi) or (ma hoa)). hieu ve cac ((xuc van) OR (vuc van)) hanh dai cua su".
• Adding a wildcard symbol may retrieve word variants: te sach ty tang ((ma hoi) or (ma hoa)). hieu ve cac ((xuc van) OR (vuc van)) hanh dai cua su*.