Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
vinh cua » sinh cua, tinh cua, dinh cua
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
tu sach » thu sach, te sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) OR (su sach))) or (thu hoach)) ky dang xay hoi. hieu va cau luc va hanh vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (su sach))) OR (thu hoach)) ky dang xay hoi. hieu va cau luc va hanh vinh cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (su sach))) or (thu hoach)) ky dang xay hoi. hieu va cau luc va hanh vinh cua tre*".