Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, vu sach
tu cach » tu cac
te sach » toc sach
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
va doan » va doanh, van doan, va dan
doan vi » doan va, don vi, doan thi
luc va » duc va, tuc va, loc va
vi cau » va cau, ve cau, di cau

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 (tu cach))) or (te sach)) ky nang x ho. hieu qua cau luc va doan vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (tu cach))) OR (te sach)) ky nang x ho. hieu qua cau luc va doan vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (tu cach))) or (te sach)) ky nang x ho. hieu qua cau luc va doan vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (tu cach))) or (te sach)) ky nang x ho. hieu qua cau luc va doan vi cau tren*.