Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
van hanh » ban hanh, van anh, van ban
nhan luc » nang luc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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