Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
mlanh hai » manh hai, thanh hai, minh hai
thuoc ban » thuoc tan, thuoc dang, thu ban
thu sach » thuat sach, thuoc sach, thu hoach
lanh hai » manh hai, thanh hai, lang chai
tu sach » su sach, te sach, tu cach
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac

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 (thu sach)) y nang ma hoi. hieu ve cao thuoc ban ((lanh hai) or (mlanh hai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoi. hieu ve cao thuoc ban ((lanh hai) OR (mlanh hai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang ma hoi. hieu ve cao thuoc ban ((lanh hai) or (mlanh hai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang ma hoi. hieu ve cao thuoc ban ((lanh hai) or (mlanh hai)) cuu tre*.