Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
va chat » van chat, va phat, cao chat
dai kho » dai khoa, dai tho, dai khong
ha hoi » ha noi, xa hoi, va hoi
dai ho » dai hoc, dai hoi, dai hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((dai kho) OR (dai ho)) tang ((ha hoi) or (hoa hoi)). hieu va chat duc van hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((dai kho) OR (dai ho)) tang ((ha hoi) OR (hoa hoi)). hieu va chat duc van hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((dai kho) OR (dai ho)) tang ((ha hoi) or (hoa hoi)). hieu va chat duc van hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((dai kho) OR (dai ho)) tang ((ha hoi) or (hoa hoi)). hieu va chat duc van hanh vai cua te*.