Perhaps you should try some spelling variations:
thien van » thi van
van nang » van quang, van ban, van dong
bach van » bach dan, cach van, bach dang
tu bach » vu bach, tu cach, tu bac
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
su bien » su kien, su hien, su tien
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bach van nang ma hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach van nang ma hoi. ((hieu ve) OR (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach van nang ma hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (vuc van)) hanh vi su bien*".