Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
trong van » trong cac
thu sach » tu sach, thuat sach, thuoc sach
tang van » dang van, hoang van, tang luan
vien cac » vien bach, vien dai, vien da
thuc dan » thuc hanh, hoc dan
van day » van duy, van dao, van dau
day cua » dai 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: thu sach y ((tang van) or (trong van)) hoa. hieu vien cac ((thuc dan) or (thuc vat)) van day cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((tang van) OR (trong van)) hoa. hieu vien cac ((thuc dan) OR (thuc vat)) van day cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((tang van) or (trong van)) hoa. hieu vien cac ((thuc dan) or (thuc vat)) van day cua te*.