Perhaps you should try some spelling variations:
tinh van » trinh van, dinh van, tinh va
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cau » van hau, van chat, toan cau
va tinh » may tinh
van dau » van dao, phan dau
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ((van nam) or (van cau)) tu va tinh van dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu ((van nam) OR (van cau)) tu va tinh van dau tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu ((van nam) or (van cau)) tu va tinh van dau tren*.