Perhaps you should try some spelling variations:
kinh kien » kinh dien, linh kien, dinh kien
cau tren » cu tren, dau tren, ca tren
kien cau » khien cau, hien cau, thien cau
sach ty » sach y, sach tu, sach thu
va kinh » va tinh, qua kinh
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cao, va cai
x hoi » o 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 ty nang ((x hoi) OR (xa hoi)). hieu ((va cam) or (va cac)) tuc va kinh kien cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (xa hoi)). hieu ((va cam) OR (va cac)) tuc va kinh kien cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((x hoi) OR (xa hoi)). hieu ((va cam) or (va cac)) tuc va kinh kien cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((x hoi) OR (xa hoi)). hieu ((va cam) or (va cac)) tuc va kinh kien cau tren*.