Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh lai
tinh bai » tinh bac, tinh hai, hinh 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
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 vai) OR (tinh bai)) 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 vai) OR (tinh bai)) dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu ((van nam) or (van cau)) tu va ((tinh vai) OR (tinh bai)) 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 vai) OR (tinh bai)) dau tren*.