Perhaps you should try some spelling variations:
van trang » vang trang, van thang, va trang
thuoc sac » thuoc sach, thuoc dac, thuoc sai
trang vai » trang va, trang tai, trang giai
cau thuc » cuu thuc, can thuc, cau phuc
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai 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: thuoc sac ky nang ma hoi. hieu va ((cau thuc) OR (cau truc)) van trang vai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang ma hoi. hieu va ((cau thuc) OR (cau truc)) van trang vai va thiet".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang ma hoi. hieu va ((cau thuc) OR (cau truc)) van trang vai va thiet*.