Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
cham loc » cham soc, chon loc, cham o
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
lang xa » lang ha, lang van
va cham » va chat, va tham
va hang » van hang, va nang, va lang
loc va » hoc va, luc va

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