Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
van tuan » van quan, van ban, anh tuan
thuc van » thuc vat, thuc dan, thuc va
ve phat » va phat, te phat, de phat
tuan ve » tuan le, quan ve, luan ve
ve pham » vi pham, v pham, ve phan
ve cua » le cua, de cua, te cua
cua te » cua tu

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: hoc sach y ((tang van) OR (dang van)) hoi. hieu ((ve pham) OR (ve phat)) thuc van tuan ve cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y ((tang van) OR (dang van)) hoi. hieu ((ve pham) or (ve phat)) thuc van tuan ve cua te~".
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((tang van) OR (dang van)) hoi. hieu ((ve pham) or (ve phat)) thuc van tuan ve cua te*.