Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tan hanh » tan thanh, tang hanh, toan hanh
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va
doi cua » dai cua, hoi cua, dong cua
cua tre » cua te, cuu tre, cua triet

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 xa hoi. ((hieu va) or (hieu qua)) pham duc tan hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky lang xa hoi. ((hieu va) OR (hieu qua)) pham duc tan hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky lang xa hoi. ((hieu va) or (hieu qua)) pham duc tan hanh doi cua tre*.