Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
vien da » vien dai, hien dai
sach ky » sac ky, sach y, sach kem
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
sach ty » sach y, sach tu, sach thu
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) tang xa hoi. hieu ((va cam) or (vien da)) tuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) tang xa hoi. hieu ((va cam) OR (vien da)) tuc va hanh vi cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) tang xa hoi. hieu ((va cam) or (vien da)) tuc va hanh vi cuu tre*".