Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
lang xa » dang xay, lang van
lang ha » long ha
le tai » le thi, ly tai, te tai
vi cua » vai cua, di cua
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((lang xa) OR (lang ha)) hoi. hieu ((le tai) OR (va cac)) thuc van hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((lang xa) OR (lang ha)) hoi. hieu ((le tai) OR (va cac)) thuc van hanh vi cua te*.