Perhaps you should try some spelling variations:
van lanh » van anh, van hanh, van manh
dua tren » dung tren
dang xay » dang van, van xay
luc van » luoc van, luu van, duc van
cua tre » cua te, cua triet, cua thep
cuu tre » cau tren, cau treo
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky dang xay hoi. hieu va cac luc van lanh dao ((((cua tre) OR (dua tren))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xay hoi. hieu va cac luc van lanh dao ((((cua tre) OR (dua tren))) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xay hoi. hieu va cac luc van lanh dao ((((cua tre) OR (dua tren))) or (cuu tre))*".