Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nhan luc » nang luc
van nhan » van phan, van thanh, danh nhan
dang xay » dang van, van xay
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sac ky)) ((nang xa) or (dang xay)) hoi. hieu van nhan luc va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) ((nang xa) OR (dang xay)) hoi. hieu van nhan luc va hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) ((nang xa) or (dang xay)) hoi. hieu van nhan luc va hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) ((nang xa) or (dang xay)) hoi. hieu van nhan luc va hanh va cua triet*.