Perhaps you should try some spelling variations:
nang dau » xang dau, nang du, nang cao
hang dau » hang va, hang tai
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cai » va cai, ve cac, ve tai
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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 ((nang dau) or (hang dau)) hoi. hieu ((ve cai) or (va cham)) ly va dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang dau) OR (hang dau)) hoi. hieu ((ve cai) OR (va cham)) ly va dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang dau) or (hang dau)) hoi. hieu ((ve cai) or (va cham)) ly va dan va cua tre*.