Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
va thuat » ky thuat, ki thuat, va thuc
va tham » van tham, va cham
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
dat cuu » dat cau, dat cua
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xa hoi. hieu ((((va tham) OR (va thuat))) or (va cao)) truc va thanh dat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu ((((va tham) OR (va thuat))) OR (va cao)) truc va thanh dat cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu ((((va tham) OR (va thuat))) or (va cao)) truc va thanh dat cuu tre*".