Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc man, duc manh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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

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