Perhaps you should try some spelling variations:
quan nam » quang nam, xuan nam, quan am
vat dung » van dung, va dung, viet dung
dung con » dung cong, dung co, dung dong
sach ty » sach tu, sach thu, xach tay
qua nam » cua nam, quang nam, qua nhat
con cua » cong cua, co cua, dong cua
cua tre » cua te, cuu tre, cua triet
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 ((qua nam) OR (quan nam)) tu vat dung con 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 ((qua nam) OR (quan nam)) tu vat dung con cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang x hoi. hieu ((qua nam) OR (quan nam)) tu vat dung con cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang x hoi. hieu ((qua nam) OR (quan nam)) tu vat dung con cua tre*.