Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau treo » cau theo, cau triet, cau trieu
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
xa hanh » xa thanh, xa khanh, va hanh
va cam » va cham, va cac, va cao
xuc xa » tuc xa, buc xa
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: ((te sach) OR (toc sach)) ky nang x hoi. hieu va cam xuc xa hanh kem ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang x hoi. hieu va cam xuc xa hanh kem ((cau treo) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang x hoi. hieu va cam xuc xa hanh kem ((cau treo) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang x hoi. hieu va cam xuc xa hanh kem ((cau treo) or (cau tren))*.