Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
hieu ke » hieu kem, chieu ke, hieu ky
lang ha » long ha
lang xa » dang xay, lang van
ke cau » ket cau
vi cua » vai cua, di 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 xa) or (lang ha)) hoi. hieu ke cau ((truc va) OR (thuc va)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay ((lang xa) OR (lang ha)) hoi. hieu ke cau ((truc va) OR (thuc va)) hanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay ((lang xa) or (lang ha)) hoi. hieu ke cau ((truc va) OR (thuc va)) hanh vi cua te*".