Perhaps you should try some spelling variations:
hang cau » hang dau, hang ca, nhung cau
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
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: tu sach ty hang cau hoi. ((hieu va) or (hieu van)) tao duoc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang cau hoi. ((hieu va) OR (hieu van)) tao duoc va hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang cau hoi. ((hieu va) or (hieu van)) tao duoc va hanh va cua te*.