Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
cham luc » cham soc, nhan luc, cham cuu
dat tren » dat trong, dua tren
dang xay » dang van, van xay
va hang » van hang, va nang, va lang
lang xa » lang ha, lang van
va cham » va chat, va tham
luc va » duc va, tuc va, loc 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 luc va hang va ((cau tren) or (dat 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 luc va hang va ((cau tren) OR (dat tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach y ((lang xa) or (dang xay)) hoi. lieu va cham luc va hang va ((cau tren) or (dat tren))*.