Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
dung dong » dung cong, vung dong, dung trong
vat dung » van dung, va dung, viet dung
dong cua » dung cua, cong cua, huong cua
sach ty » sach tu, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc
tu vat » tu va, tu van, tu bat
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) nang x hoi. hieu quang nam tu vat dung dong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x hoi. hieu quang nam tu vat dung dong cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang x hoi. hieu quang nam tu vat dung dong cua tre*.