Perhaps you should try some spelling variations:
khang tiet » thang tien, hang tieu, hang tien
vat khang » van khang, vat khong, va khang
va triet » va thiet, va trien, ve triet
cau thuc » cau truc, cuu thuc, can thuc
hieu van » hieu va, thien van, lieu va
tiet va » tien va, tiet may, viet van
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
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: ((((tu sach) or (te sach))) or (vu bach)) ky tang ma hoi. hieu van cau thuc vat khang tiet va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (te sach))) OR (vu bach)) ky tang ma hoi. hieu van cau thuc vat khang tiet va triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (te sach))) or (vu bach)) ky tang ma hoi. hieu van cau thuc vat khang tiet va triet*.