Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
lo lang » o lang, le lang, hoa lang
so lang » o lang, so dang, hoa lang
qua cac » cua cac
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
loc va » hoc va, luc va
va cua » va chua, via cua, ca 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: tu sach ((lo lang) or (so lang)) xa hoi. hieu qua cac loc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo lang) OR (so lang)) xa hoi. hieu qua cac loc va hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo lang) or (so lang)) xa hoi. hieu qua cac loc va hanh va cua te*.