Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
bach han » sach han, bach ha, bach dan
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach han ((nang xa) or (nang x)) hoi. hieu ve cham thuc ban hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach han ((nang xa) OR (nang x)) hoi. hieu ve cham thuc ban hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu bach han ((nang xa) or (nang x)) hoi. hieu ve cham thuc ban hanh ((vi cua) or (di cua)) tre*.