Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang xay » dang van, van xay
cham cuu » cap cuu, chat cua
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 hanh » van hanh, va thanh, va danh
cuu va » cuu van, cuu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y ((lang xa) or (dang xay)) hoi. lieu va cham cuu va hanh vi ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((lang xa) OR (dang xay)) hoi. lieu va cham cuu va hanh vi ((cau tren) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y ((lang xa) or (dang xay)) hoi. lieu va cham cuu va hanh vi ((cau tren) or (dau tren))*.