Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
manh hai » lanh hai, minh hai, thanh hai
dang xay » dang van, van xay
van manh » van minh, van anh, van hanh
sach tay » xach tay, sach hay, sach nay
xuc van » duc van, luc van, vuc van
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
lang xa » lang ha, lang van
cuu 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 tay ((lang xa) OR (dang xay)) hoi. hieu vien cac xuc van manh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay ((lang xa) OR (dang xay)) hoi. hieu vien cac xuc van manh hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay ((lang xa) OR (dang xay)) hoi. hieu vien cac xuc van manh hai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach tay ((lang xa) OR (dang xay)) hoi. hieu vien cac xuc van manh hai ((cua tre) or (cuu tre))*.