Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van dam » van nam, van dao, van dau
van cau » van dau, van hau, van chat
bai dau » bat dau, bi dau, ban dau

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 xa hoi. hieu ((van dam) or (van cau)) tu ((va tinh) OR (may tinh)) bai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu ((van dam) OR (van cau)) tu ((va tinh) OR (may tinh)) bai dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ((van dam) or (van cau)) tu ((va tinh) OR (may tinh)) bai dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ((van dam) or (van cau)) tu ((va tinh) OR (may tinh)) bai dau tren*.