Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
sang xa » song xa, lang xa, sang ma
ty sang » ty xang, ty hang, duy sang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc 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 sang xa hoi. ((hieu ve) OR (hieu van)) nhan luc va ((thanh vai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty sang xa hoi. ((hieu ve) OR (hieu van)) nhan luc va ((thanh vai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty sang xa hoi. ((hieu ve) OR (hieu van)) nhan luc va ((thanh vai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty sang xa hoi. ((hieu ve) OR (hieu van)) nhan luc va ((thanh vai) or (thanh tai)) cua tre*.