Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach vay
sach nay » sach vay, sach nang, sach ngan
hieu thi » sieu thi, hieu chi, hiep thi
thi chat » thi cham, tri chat, thi chap
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: nuoc ((sach hay) or (sach nay)) lang xa hoi. hieu thi chat ((duc van) OR (duc tan)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc ((sach hay) OR (sach nay)) lang xa hoi. hieu thi chat ((duc van) OR (duc tan)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc ((sach hay) or (sach nay)) lang xa hoi. hieu thi chat ((duc van) OR (duc tan)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach hay) or (sach nay)) lang xa hoi. hieu thi chat ((duc van) OR (duc tan)) hanh vi cua tre*.