Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
dang xay » dang van
sach ty » sach y, sach tu, sach thu
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, dua tren
te sach » toc sach

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

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