Perhaps you should try some spelling variations:
thien van » thi van
tinh vai » tinh va, tinh hai, tinh bai
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
va tinh » may tinh
vai cau » va cau, van cau, vai cac
cam tu » cam thu, nam tu, dam tu
o hoi » co hoi, o hoc, o hai

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