Perhaps you should try some spelling variations:
hieu chi » hieu cac, hieu moi
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
dang xay » dang van, van xay
chi cham » chin cham, thi cham, khi cham
duc ban » duc tan, duc van, dua ban
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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 sach ky ((nang xa) or (dang xay)) hoi. hieu chi cham duc ban hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (dang xay)) hoi. hieu chi cham duc ban hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (dang xay)) hoi. hieu chi cham duc ban hanh ((vi cua) or (di cua)) tre*.