Perhaps you should try some spelling variations:
thien van » thi van
loai nang » loai nam, luan nang, loai san
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cau duc » cao duc, cau luc, chu duc
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
te sach » toc sach
vi cua » vai cua, di cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) loai nang xa hoi. ((thien van) OR (hieu va)) cau duc va danh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) loai nang xa hoi. ((thien van) or (hieu va)) cau duc va danh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) loai nang xa hoi. ((thien van) or (hieu va)) cau duc va danh vi cua te*.