Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cuc viet » chuc viet, tuc viet, cua viet
van nhan » van phan, danh nhan, van khanh
cao suc » cao su
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
cao duc » dao duc, giao duc, tao duoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang

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 lo nang xa hoi. hieu va ((cao duc) OR (cao suc)) ((van nhan) or (van thanh)) tai cuc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo nang xa hoi. hieu va ((cao duc) OR (cao suc)) ((van nhan) OR (van thanh)) tai cuc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo nang xa hoi. hieu va ((cao duc) OR (cao suc)) ((van nhan) or (van thanh)) tai cuc viet".
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang xa hoi. hieu va ((cao duc) OR (cao suc)) ((van nhan) or (van thanh)) tai cuc viet*.