Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luc » cham soc, nhan luc, cham cuu
lang van » dang van, tang van, hoang van
va cham » va chat, va tham
cuu tre » cau tren, cau treo
luc van » luoc van, luu van, duc van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay
cua tre » cua te, cua triet, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) OR (lang van)) hoi. lieu va cham luc van hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang van)) hoi. lieu va cham luc van hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) OR (lang van)) hoi. lieu va cham luc van hanh vi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) OR (lang van)) hoi. lieu va cham luc van hanh vi ((cuu tre) or (cua tre))*.