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
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va

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