Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
cua tre » cuu tre, cua triet, dua tren
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
dac van » cac van, dao van, dam van
su sai » su hai, su dai, su mai
ve cac » va cac, vien cac
su tai » su thi, tu tai
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: ((su sai) OR (su tai)) ky dang xay hoi. hieu ve cac dac van hanh than ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su tai)) ky dang xay hoi. hieu ve cac dac van hanh than ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su tai)) ky dang xay hoi. hieu ve cac dac van hanh than ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su sai) OR (su tai)) ky dang xay hoi. hieu ve cac dac van hanh than ((cua tre) or (cua te))*.