Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
khang ma » khan ma, khang a, khong ma
qua chat » qua nhat, qua cham, luan chat
su sach » so sach, vu sach
hanh va » hang va
su viet » so viet
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 thieu khang ma hoi. hieu qua chat ((xuc va) or (tuc va)) ((hanh vi) or (hanh va)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thieu khang ma hoi. hieu qua chat ((xuc va) OR (tuc va)) ((hanh vi) OR (hanh va)) su viet.
• Adding a wildcard symbol may retrieve word variants: su sach thieu khang ma hoi. hieu qua chat ((xuc va) or (tuc va)) ((hanh vi) or (hanh va)) su viet*.