Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vanh dai » van dai, lanh dao, van dao
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
nhan luc » nang luc
vanh tai » van tai, hanh tai, anh tai
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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: tu sach ky dang xa hoi. hieu van nhan luc va ((vanh dai) or (vanh tai)) ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu van nhan luc va ((vanh dai) OR (vanh tai)) ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu van nhan luc va ((vanh dai) or (vanh tai)) ((cua tre) or (cua triet))*.