Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nhan luc » nang luc
va trien » va truyen, va thiet, va tuyen
ban hanh » ban hang
tay lang » tai lang, tay tang, tay quang
luc ban » duc ban, cuc ban, luc bat
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
ty lang » ty xang, ty hang, tu lang
su tien » su kien, su hien, tu tieng

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 ((ty lang) or (tay lang)) xa hoi. hieu va nhan luc ban hanh vi ((va trien) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty lang) OR (tay lang)) xa hoi. hieu va nhan luc ban hanh vi ((va trien) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty lang) or (tay lang)) xa hoi. hieu va nhan luc ban hanh vi ((va trien) or (su tien))*.