Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
thanh tai » thanh hai, thanh toan, doanh tai
hieu vien » hieu hien, hieu viec, thieu nien
hanh tai » hang tai, han tai, hinh tai
tu sach » thu sach, su sach, te sach
tuoc va » thuoc va, nuoc va, duoc va
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu vien bach tuoc va ((hanh tai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu vien bach tuoc va ((hanh tai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (lang xa)) hoi. hieu vien bach tuoc va ((hanh tai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu vien bach tuoc va ((hanh tai) or (thanh tai)) cua tre*.