Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nhan luc » nang luc
ban hanh » ban hang
tu sach » su sach, te sach, tu cach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va nhan » van nhan, ca nhan, va phan
luc ban » duc ban, cuc ban, luc bat
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) ky lang xa hoi. lieu va nhan luc ban hanh vi ((va thiet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky lang xa hoi. lieu va nhan luc ban hanh vi ((va thiet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky lang xa hoi. lieu va nhan luc ban hanh vi ((va thiet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky lang xa hoi. lieu va nhan luc ban hanh vi ((va thiet) or (su viet))*.