Perhaps you should try some spelling variations:
hay quang » ha quang, hao quang, vay quang
tay quang » tac quang, tai quang, tao quang
manh hai » lanh hai, thanh hai, van hai
minh hai » minh khai, tinh hai, minh chau
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
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: tu sach ((hay quang) OR (tay quang)) xa hoi. hieu va pham duc va ((manh hai) or (minh hai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hay quang) OR (tay quang)) xa hoi. hieu va pham duc va ((manh hai) OR (minh hai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((hay quang) OR (tay quang)) xa hoi. hieu va pham duc va ((manh hai) or (minh hai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((hay quang) OR (tay quang)) xa hoi. hieu va pham duc va ((manh hai) or (minh hai)) cuu tre*.