Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu anh » hieu manh, chieu xanh, hieu nganh
tuan hoc » toan hoc, luan hoc, than hoc
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((te sac) or (toc sach))) or (ve cac)) ky dang xa hoi. hieu anh tuan hoc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sac) OR (toc sach))) OR (ve cac)) ky dang xa hoi. hieu anh tuan hoc va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((((te sac) or (toc sach))) or (ve cac)) ky dang xa hoi. hieu anh tuan hoc va hanh vi luu tre*.