Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
dang xay » dang van, van xay
thai cua » than cua, tai cuc, tri cua
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su mai
su dai » sau dai, si dai, su tai

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 dai)) ky dang xay hoi. hieu ve pham ((duc van) or (duc tan)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky dang xay hoi. hieu ve pham ((duc van) OR (duc tan)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su dai)) ky dang xay hoi. hieu ve pham ((duc van) or (duc tan)) hanh thai cua tre*.