Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
va tinh » may tinh
vai dau » va dau, van dau, xvii dau
x hoi » xa hoi, o hoi, 5 hoi

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