Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van tuan » van quan, van ban, anh tuan
vai cua » dai cua, hai cua, lai cua
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) _ lang xa hoi. hieu ve cam thuc van tuan ((di cua) OR (vai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) _ lang xa hoi. hieu ve cam thuc van tuan ((di cua) or (vai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) _ lang xa hoi. hieu ve cam thuc van tuan ((di cua) or (vai cua)) te*.