Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hanh tai » hang tai, han tai, hinh tai
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac duc ban ((hanh tai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac duc ban ((hanh tai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac duc ban ((hanh tai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) tang xa hoi. hieu ve cac duc ban ((hanh tai) or (thanh tai)) cua tre*.