Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
dieu tra » dieu tri, kiem tra, dieu cua
te sach » toc sach
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
tra tre » tran tren, tran tri, tran tro
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((thien van) OR (thi van)) hau ((luc van) or (duc van)) hanh dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang xa hoi. ((thien van) OR (thi van)) hau ((luc van) OR (duc van)) hanh dieu tra tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang xa hoi. ((thien van) OR (thi van)) hau ((luc van) or (duc van)) hanh dieu tra tre".
• Adding a wildcard symbol may retrieve word variants: te sach v nang xa hoi. ((thien van) OR (thi van)) hau ((luc van) or (duc van)) hanh dieu tra tre*.