Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
tinh van » trinh van, dinh van, tinh va
van cau » van dau, van hau, van chat
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
cam tu » cam thu, dam tu, tam tu
nam tu » nam thu, nam thuc
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 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 (o hoi)). thien van ((cam tu) OR (nam tu)) va tinh van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (o hoi)). thien van ((cam tu) OR (nam tu)) va tinh van cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((x hoi) or (o hoi)). thien van ((cam tu) OR (nam tu)) va tinh van cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (o hoi)). thien van ((cam tu) OR (nam tu)) va tinh van cau tren*.