Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, tho nang
thu bang » thu ban, thu hang, chu bang
tu sach » thu sach, su sach, te sach
dinh vi » dinh ve, dinh viet, dinh tri
va chat » van chat, va phat, cao chat
cao hoi » cau hoi, co hoi, cao hoc
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((thu nang) or (thu bang)) cao hoi. lieu va chat ((soc va) OR (doc va)) dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu bang)) cao hoi. lieu va chat ((soc va) OR (doc va)) dinh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thu nang) or (thu bang)) cao hoi. lieu va chat ((soc va) OR (doc va)) dinh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu nang) or (thu bang)) cao hoi. lieu va chat ((soc va) OR (doc va)) dinh vi cua te*.