Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, 5 hoi

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 ky nang ((x hoi) OR (x ho)). hieu va cam ((tuc va) or (loc va)) hanh tranh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((x hoi) OR (x ho)). hieu va cam ((tuc va) OR (loc va)) hanh tranh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((x hoi) OR (x ho)). hieu va cam ((tuc va) or (loc va)) hanh tranh cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((x hoi) OR (x ho)). hieu va cam ((tuc va) or (loc va)) hanh tranh cua tre*.