Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
dang xay » dang van, van xay
sach thu » sach thue, sach thieu, sach tham
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc dan, thuc day
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, lang van
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((lang xa) or (dang xay)) hoi. hieu quang nam ((thuc va) OR (thuc vat)) dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((lang xa) OR (dang xay)) hoi. hieu quang nam ((thuc va) OR (thuc vat)) dan vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu ((lang xa) or (dang xay)) hoi. hieu quang nam ((thuc va) OR (thuc vat)) dan vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((lang xa) or (dang xay)) hoi. hieu quang nam ((thuc va) OR (thuc vat)) dan vai cuu tre*.