Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tan hanh » tan thanh, tang hanh, toan hanh
te sach » toc sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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