Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
tang ma » mang may, tang van
truc va » thuc va, thuc vat, trung va
danh vu » danh tu, anh vu, danh du
sach 7 » sach y, sach 2
7 tang » 6 tang
ma hoi » mai hoi, xa hoi, ma hoa
qua ca » qua cac, qua cua, qua cai
vu va » vu van, tu va, su va
thiet » thieu

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 7 tang ma hoi. hieu qua ca ((truc va) or (thuc day)) danh vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 tang ma hoi. hieu qua ca ((truc va) OR (thuc day)) danh vu va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach 7 tang ma hoi. hieu qua ca ((truc va) or (thuc day)) danh vu va thiet*.