Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
lang xa » lang ha, dang xay, lang van
va chat » van chat, va phat, cao chat
hanh va » hang va, hanh vi

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 _ lang xa hoi. lieu va chat va van hanh va ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach _ lang xa hoi. lieu va chat va van hanh va ((cau tren) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach _ lang xa hoi. lieu va chat va van hanh va ((cau tren) or (dau tren))*.