Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thac toc » cac toc, thac cac, thi toc
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
toc va » hoc va, toc ta, tuc va
vi cau » va cau, ve cau, di cau
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: toc sach ky nang x hoi. ((hieu va) OR (lieu va)) thac toc va danh vi cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. ((hieu va) OR (lieu va)) thac toc va danh vi cau treo".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. ((hieu va) OR (lieu va)) thac toc va danh vi cau treo*.