Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
trong van » trong cac
hien cac » thien cac, vien cac, hieu cac
tang van » dang van, hoang van, tang luan
truc ban » thuc ban, truc dan, truc van
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach o » sach lo, sac o, sach y
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: su sach o ((tang van) or (trong van)) hoi. hieu hien cac ((thuc dan) or (truc ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach o ((tang van) OR (trong van)) hoi. hieu hien cac ((thuc dan) OR (truc ban)) hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach o ((tang van) or (trong van)) hoi. hieu hien cac ((thuc dan) or (truc ban)) hanh vi cua te*.