Perhaps you should try some spelling variations:
van lanh » van anh, van hanh, van manh
thu sai » thu hai, thu tai, thu san
cua tre » cua te, cua triet, dua tren
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
qua cac » cua cac
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
cuu tre » cau tren, cau treo
sai ky » sac ky

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

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