Perhaps you should try some spelling variations:
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
va nang » van nang, da nang, cam nang
tu sach » thu sach, su sach, tu cach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
luc va » duc va, tuc va, loc va
di duc » do duc, oi duc, dinh duc
di du » li du

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) or (te sach)) ky lang xa hoi. hieu van nhan luc va nang ((di duc) OR (di du)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang xa hoi. hieu van nhan luc va nang ((di duc) OR (di du)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky lang xa hoi. hieu van nhan luc va nang ((di duc) OR (di du)) tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky lang xa hoi. hieu van nhan luc va nang ((di duc) OR (di du)) tren*.