Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
hanh va » hang va, hanh vi
tu dan » tuc dan, tu ban, cu dan
dan ky » van ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky nang ma hoi. hieu va giao duc va ((hanh va) or (thanh doi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky nang ma hoi. hieu va giao duc va ((hanh va) OR (thanh doi)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu dan ky nang ma hoi. hieu va giao duc va ((hanh va) or (thanh doi)) cau tren*.