Perhaps you should try some spelling variations:
nang duoc » ngang duoc, nang doc, nganh duoc
tim triet » tu triet
vi triet » ve triet, va triet, va trien
van nang » van quang, van ban, van dong
duoc hoi » quoc hoi, duoc hoc, duoc si
cao suc » cao su, cao duc
su sach » so sach
vu sach » vu bach, vu khach
suc va » duc va, tuc va, luc va
va anh » van anh, va danh, va hanh
anh va » hanh va
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) van nang duoc hoi. lieu va cao suc va anh va ((vi triet) OR (tim triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) van nang duoc hoi. lieu va cao suc va anh va ((vi triet) OR (tim triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van nang duoc hoi. lieu va cao suc va anh va ((vi triet) OR (tim triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van nang duoc hoi. lieu va cao suc va anh va ((vi triet) OR (tim triet))*.