Perhaps you should try some spelling variations:
bang thanh » ban thanh, dang thanh, tang thanh
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
tham hoc » thai hoc, tham hoa, than hoc
hoc bang » hoc bong, hoc tang, hoc dan
thanh vi » hanh vi, thanh va, thanh ve
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang xa hoi. ((hieu van) or (thien van)) tham hoc bang thanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. ((hieu van) OR (thien van)) tham hoc bang thanh vi dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xa hoi. ((hieu van) or (thien van)) tham hoc bang thanh vi dau tren*.