Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van bao, van hac, dan bac
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tac va » tac da, tac xa, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. thien ((van bac) OR (van ban)) tac va thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. thien ((van bac) OR (van ban)) tac va thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. thien ((van bac) OR (van ban)) tac va thanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. thien ((van bac) OR (van ban)) tac va thanh vi ((cua tre) or (cuu tre))*.