Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh va » thanh van, hanh va, thanh ha
tham hoc » thai hoc, tham hoa, than hoc
hieu van » hieu va, lieu va, hieu ve
hoc ban » hoc bang, hoc dan, hoc bai
te sach » toc sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
va cau » van cau, va cac, va 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 lang) or (ky dang)) xa hoi. ((hieu van) or (thien van)) tham hoc ban thanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) xa hoi. ((hieu van) OR (thien van)) tham hoc ban thanh va cau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky dang)) xa hoi. ((hieu van) or (thien van)) tham hoc ban thanh va cau tren*.