Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
tu cach » tu cac
te sach » toc sach
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
luc va » duc va, tuc va, loc va
va don » va dong, va doc, va do
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (te sach)) ky nang x ho. hieu qua cau luc va don vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky nang x ho. hieu qua cau luc va don vi dau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky nang x ho. hieu qua cau luc va don vi dau tren*.