Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
hieu thai » hieu thao, hinh thai, lieu tham
doc hieu » toc thieu, hoc thieu, hoc hien
thai cua » than cua, tai cuc, tri cua
nhung bi » nhung gi
sach ha » sach nha, sach han, sach xa
ho vi » hoc vi, hoa vi, ho voi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ha) or (cach thoi)) doc hieu thai cua ets : ((nhung bi) or (nhung bai)) ho vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ha) OR (cach thoi)) doc hieu thai cua ets : ((nhung bi) OR (nhung bai)) ho vi đai.
• Adding a wildcard symbol may retrieve word variants: doc ((sach ha) or (cach thoi)) doc hieu thai cua ets : ((nhung bi) or (nhung bai)) ho vi đai*.