Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
chau chu » chao chu, chau phu, cau chu
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
chu van » cuu van, chu han
va chau » va chat, va cau, va cham
dai hoi » dai hoc, dai hai, dai moi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
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: thu ((sac ky) or (sach y)) tang ((ma hoa) or (dai hoi)). hieu va chau chu van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (sach y)) tang ((ma hoa) OR (dai hoi)). hieu va chau chu van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sac ky) or (sach y)) tang ((ma hoa) or (dai hoi)). hieu va chau chu van hanh di cua tre*.