Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
ban hanh » ban hang
nhan luc » nang luc
sach ky » sac ky, sach y, sach ty
luc ban » duc ban, cuc ban, luc bat
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
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 ky ((nang xa) or (sang ma)) 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 ky ((nang xa) OR (sang ma)) hoi. hieu va nhan luc ban hanh vi ((va trien) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (sang ma)) hoi. hieu va nhan luc ban hanh vi ((va trien) or (su tien))*.