Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hieu sau » hieu suat, tieu su, hieu va
chat huu » pham huu
van hanh » van thanh, ban hanh, van anh
thu ban » thu hang
ky sang » ky nang, ky dang, ky tang
mai hai » mai thai, dai hai, mai mai
hieu su » tieu su, hieu so, hieu suat
huu van » cuu van, huu han, luu van
ban ky » van ky, dan ky
vi cua » vai cua, di cua
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: thu ban ky sang mai hai. ((hieu su) or (hieu sau)) chat huu van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban ky sang mai hai. ((hieu su) OR (hieu sau)) chat huu van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu ban ky sang mai hai. ((hieu su) or (hieu sau)) chat huu van hanh vi cua te*.