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 vi » hanh vi, thanh va, thanh ve
tham soc » cham soc, tham nuoc, thai son
hieu van » hieu va, lieu va, hieu ve
soc ban » hoc ban, coc ban, so ban
te sach » toc sach
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
vi cau » va cau, ve cau, di cau

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 soc ban thanh vi 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 soc ban thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky dang)) xa hoi. ((hieu van) or (thien van)) tham soc ban thanh vi 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 soc ban thanh vi cau tren*.