Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luc ngan » luc nganh, luc nhan, luat ngan
cau tren » cu tren, dau tren, ca tren
tu cach » tu cac
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hang vi » hang va, hanh vi, hang di
ve cau » ke cau, va cau, ve cac
vi cau » va cau, di cau, viet 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 cach) or (thu sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ty xang xa hoi. hieu ve cau luc ngan hang vi cau tren*.