Perhaps you should try some spelling variations:
ban hanh » ban hang
nhan luc » nang luc
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, xach tay
va nhan » van nhan, ca nhan, va phan
luc ban » duc ban, cuc ban, luc bat
hieu va » lieu va, hieu qua

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