Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dau tren » dau tien, dat tren, dau tieng
thanh ve » hanh ve, thanh va, thanh vien
nang doc » nang luc
vu cham » vu kham, tu cham, qua cham
luc van » luoc van, luu van, duc van
doc hoc » duoc hoc, toc hoc, duc hoc
va cham » va chat, va tham
sac ky » cac ky
ve dau » va dau, ve du, ke dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sac ky) OR (sai ky)) nang doc hoc. hieu ((va cham) or (vu cham)) luc van thanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (sai ky)) nang doc hoc. hieu ((va cham) OR (vu cham)) luc van thanh ve dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) OR (sai ky)) nang doc hoc. hieu ((va cham) or (vu cham)) luc van thanh ve dau tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sac ky) OR (sai ky)) nang doc hoc. hieu ((va cham) or (vu cham)) luc van thanh ve dau tren*.