Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
thu sac » thu sach, thu san, thu xac
chu tre » cho tre, chu tri, cuu tre
hieu va » lieu va, hieu qua
cac co » cac cong
co va » co ma, do va, so va
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: ((thu sac) or (thuoc sach)) ky nang x hoi. hieu va cac co va ((hanh hai) OR (hang hai)) chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thuoc sach)) ky nang x hoi. hieu va cac co va ((hanh hai) OR (hang hai)) chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sac) or (thuoc sach)) ky nang x hoi. hieu va cac co va ((hanh hai) OR (hang hai)) chu tre*".