Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh tai » thanh tai, hang tai, hinh tai
dang xay » dang van, van xay
te sach » toc sach
han tai » hang tai, nhan tai, van tai
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cuc tre » duc tre, cua tre, cuu tre
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ky dang xay hoi. hieu ve cac luc va ((hanh tai) OR (han tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky dang xay hoi. hieu ve cac luc va ((hanh tai) OR (han tai)) cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky dang xay hoi. hieu ve cac luc va ((hanh tai) OR (han tai)) cuc tre*".