Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
trung va » truong va, trang va, trung ha
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
lang ha » long ha
ve cau » ke cau, va cau, ve cac
ha hoi » hoa hoi, ha noi, xa hoi
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 tay lang ha hoi. hieu ve cau ((thuc va) or (trung va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay lang ha hoi. hieu ve cau ((thuc va) OR (trung va)) hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach tay lang ha hoi. hieu ve cau ((thuc va) or (trung va)) hanh va cua te*.