Perhaps you should try some spelling variations:
thien van » thi van
hanh thai » nhanh thai, hinh thai, anh thai
hanh tai » thanh tai, hang tai, han tai
xuc van » duc van, luc van, vuc van
van bac » van ban, van bao, van hac
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky ((lang xa) OR (lang ha)) hoi. thien van bac xuc van ((hanh thai) OR (hanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((lang xa) OR (lang ha)) hoi. thien van bac xuc van ((hanh thai) or (hanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((lang xa) OR (lang ha)) hoi. thien van bac xuc van ((hanh thai) or (hanh tai)) cua tre*.