Perhaps you should try some spelling variations:
viet bao » viec bao, viet lao, viet bac
thu nang » thi nang, thu hang, thu bang
viet dao » viet lao, viet da, viet dat
thuc can » thuc chan, thuc dan, thuc van
sach thu » sach thue, sach thieu, sach tham
thuc ca » thuc cua, thuc cao, thuc va
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua

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 thu nang xa hoi. nhien ((viet dao) OR (viet bao)) ((thuc ca) or (thuc can)) don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. nhien ((viet dao) OR (viet bao)) ((thuc ca) OR (thuc can)) don vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. nhien ((viet dao) OR (viet bao)) ((thuc ca) or (thuc can)) don vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. nhien ((viet dao) OR (viet bao)) ((thuc ca) or (thuc can)) don vi cua tre*.