Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
cau phuc » cau truc, chau phu, huu phuc
cau luc » cau truc
va hanh » van hanh, va thanh, va danh
sach o » sach lo, sac o, sach y
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach o ((lang van) or (dang van)) hoa. hieu qua ((cau luc) or (cau phuc)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o ((lang van) OR (dang van)) hoa. hieu qua ((cau luc) OR (cau phuc)) va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach o ((lang van) or (dang van)) hoa. hieu qua ((cau luc) or (cau phuc)) va hanh vi cua te*.