Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh dai » hanh dao, vanh dai, thanh dat
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
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: ((thu sach) or (te sach)) ky dang xa hoi. hieu ve pham duc va ((hanh dai) OR (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky dang xa hoi. hieu ve pham duc va ((hanh dai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky dang xa hoi. hieu ve pham duc va ((hanh dai) OR (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky dang xa hoi. hieu ve pham duc va ((hanh dai) OR (hanh tai)) cua tre*.