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
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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