Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, duc man
dua ban » dia ban, cua ban, qua ban
hanh ki » hanh vi, hanh ky, hanh kien
su viet » so viet
sach 2 » sach y
2 nang » v nang
ve cac » va cac, vien cac
ki su » ky su

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 2 nang xa hoi. hieu ve cac ((duc ban) or (dua ban)) hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang xa hoi. hieu ve cac ((duc ban) OR (dua ban)) hanh ki su viet*.