Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
van thanh » ban thanh, van tuan
chet duoc » che duoc, cho duoc, che quoc
va triet » va thiet, va trien, ve triet
chat duc » chat xuc, chat doc, pham duc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
lap va » tap va

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 ty nang xa hoi. ((hieu va) or (hieu ve)) ((chat duc) OR (chet duoc)) van thanh lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu va) OR (hieu ve)) ((chat duc) OR (chet duoc)) van thanh lap va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu va) or (hieu ve)) ((chat duc) OR (chet duoc)) van thanh lap va triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu va) or (hieu ve)) ((chat duc) OR (chet duoc)) van thanh lap va triet*.