Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
hoc sach » hoc sinh, hoc cac, hoc anh
cap nuoc » dat nuoc
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hai cho » han cho, hoi cho, lai cho
cho tre » cho thue, khoe tre
va cap » va cac, va dap, va cao
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: ((doc sach) OR (hoc sach)) ky nang x hoi. hieu va cap nuoc va hanh hai cho tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (hoc sach)) ky nang x hoi. hieu va cap nuoc va hanh hai cho tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (hoc sach)) ky nang x hoi. hieu va cap nuoc va hanh hai cho tre*.