Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
vai cau » va cau, van cau, vai cac
xa hanh » xa thanh, xa khanh, va hanh
va cham » va chat, va tham
tu sach » thu sach, su sach, tu cach
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
va cam » va cac, va cao, va cai
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (te sach)) ty nang o hai. hieu ((va cam) or (va cham)) tuc xa hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang o hai. hieu ((va cam) OR (va cham)) tuc xa hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty nang o hai. hieu ((va cam) or (va cham)) tuc xa hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty nang o hai. hieu ((va cam) or (va cham)) tuc xa hanh vai cau tren*.