Perhaps you should try some spelling variations:
tao nganh » tao nhan, cac nganh, da nganh
ban hanh » ban hang
chua tre » chua tri, cua tre, chua trieu
so sach » so sanh, bo sach, co sach
bac hoi » bac ho, bac hoc, sach hoi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc ban » duc tan, duc van, dua ban
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((tao nganh) or (bao cao)) bac hoi. hieu va pham duc ban hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((tao nganh) OR (bao cao)) bac hoi. hieu va pham duc ban hanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((tao nganh) or (bao cao)) bac hoi. hieu va pham duc ban hanh va chua tre*.