Perhaps you should try some spelling variations:
hang cau » hang dau, hang ca, nhung cau
xach tay » canh tay
hieu van » hieu va, thien van, lieu va
tao duc » tao duoc, dao duc, cao duc
hanh va » hang va, hanh vi
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
va cua » va chua, via cua, ca cua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((xach tay) or (sach tu)) hang cau hoi. ((hieu ve) OR (hieu van)) tao duc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((xach tay) OR (sach tu)) hang cau hoi. ((hieu ve) OR (hieu van)) tao duc va hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((xach tay) or (sach tu)) hang cau hoi. ((hieu ve) OR (hieu van)) tao duc va hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((xach tay) or (sach tu)) hang cau hoi. ((hieu ve) OR (hieu van)) tao duc va hanh va cua te*.