Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
tham soc » cham soc, tham nuoc, thai son
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
soc ban » hoc ban, coc ban, so ban
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cu tren » tu tren, dua tren
vi cu » vi su, vi xu, vi du

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 tang)) xa hoi. ((hieu van) or (thien van)) tham soc ban thanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) xa hoi. ((hieu van) OR (thien van)) tham soc ban thanh vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky tang)) xa hoi. ((hieu van) or (thien van)) tham soc ban thanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky tang)) xa hoi. ((hieu van) or (thien van)) tham soc ban thanh vi cu tren*.