Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
tang van » dang van, hoang van, trong van
te sach » toc sach
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
luy tre » luyen tre
vi luy » vi lua, vi luu

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 ((mang xa) or (tang van)) hoi. hieu va cham soc ((van hanh) OR (van thanh)) vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (tang van)) hoi. hieu va cham soc ((van hanh) OR (van thanh)) vi luy tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((mang xa) or (tang van)) hoi. hieu va cham soc ((van hanh) OR (van thanh)) vi luy tre*".