Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
luc nhan » luc nhat, cu nhan, tue nhan
cau luc » cau truc, cau phuc
hang vi » hang va, hang di, khang voi
ca tren » cau tren, cu tren, la tren
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cau » van cau, va cac, va 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 ((sach ty) or (sach thu)) nang xa hoi. hieu va cau luc nhan ((hang vi) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu va cau luc nhan ((hang vi) OR (hanh vi)) ca tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu va cau luc nhan ((hang vi) or (hanh vi)) ca tren*.