Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
cam hoc » cao hoc, cam hoa, cac hoc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
dang xa » lang xa, dang ha, dang va
am hoc » ad hoc
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: vu sach ty ((dang xa) or (dang xay)) hoi. hieu ve ((cam hoc) OR (am hoc)) gia thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((dang xa) OR (dang xay)) hoi. hieu ve ((cam hoc) OR (am hoc)) gia thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((dang xa) or (dang xay)) hoi. hieu ve ((cam hoc) OR (am hoc)) gia thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((dang xa) or (dang xay)) hoi. hieu ve ((cam hoc) OR (am hoc)) gia thanh vi cua te*.