Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu thi » hieu chi, hiep thi, kieu thi
sieu thi » trieu thi, dieu tri, su thi
sach ha » sach nha, sach han, sach xa
ha lang » hoa lang, ha tang, va lang
lang xa » lang ha, dang xay, lang van
duc van » duc va, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
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: thuoc sach ha lang xa hoi. ((hieu thi) OR (sieu thi)) chap ((duc van) or (duc tan)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ha lang xa hoi. ((hieu thi) OR (sieu thi)) chap ((duc van) OR (duc tan)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ha lang xa hoi. ((hieu thi) OR (sieu thi)) chap ((duc van) or (duc tan)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ha lang xa hoi. ((hieu thi) OR (sieu thi)) chap ((duc van) or (duc tan)) hanh vi cua tre*.