Perhaps you should try some spelling variations:
thien van » thi van
dua tren » dung tren
cau thuc » cau truc, cuu thuc, can thuc
hai dua » hai cua, dai dua, hai qua
dau hai » dai hai, dau ha, cau hai
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
vu sach » vu bach, vu khach
va dau » va dao
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (vu sach))) or (so sach)) ly nang ma hoi. thien van cau thuc va dau hai dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (vu sach))) OR (so sach)) ly nang ma hoi. thien van cau thuc va dau hai dua tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((su sach) OR (vu sach))) or (so sach)) ly nang ma hoi. thien van cau thuc va dau hai dua tren*".