Perhaps you should try some spelling variations:
hanh dien » nhanh dien, hang dien, danh dien
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
toc sach » hoc sach, doc sach, thuoc sach
dien cuc » dien tu, dieu cua, vien cac
tham soc » cham soc, thai son, ham so
va hanh » van hanh, va thanh, va danh
cuc tre » duc tre, cua tre, cuu tre
co hoi » co hoc, co loi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang ((o hoi) OR (co hoi)). hieu qua ((tham soc) or (tham nuoc)) va hanh dien cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((o hoi) OR (co hoi)). hieu qua ((tham soc) OR (tham nuoc)) va hanh dien cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang ((o hoi) OR (co hoi)). hieu qua ((tham soc) or (tham nuoc)) va hanh dien cuc tre*".