Perhaps you should try some spelling variations:
bach benh » mach benh, cac benh, benh benh
cam quoc » cac quoc, cao quoc, nam quoc
te sach » toc sach
hieu va » lieu va, hieu qua
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, va hoi
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
cua te » cua tu
buou » buoc, buon, buu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y lang ((ha hoi) OR (xa hoi)). hieu va cam quoc ((bach benh) or (buou benh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang ((ha hoi) OR (xa hoi)). hieu va cam quoc ((bach benh) OR (buou benh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y lang ((ha hoi) OR (xa hoi)). hieu va cam quoc ((bach benh) or (buou benh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: te sach y lang ((ha hoi) OR (xa hoi)). hieu va cam quoc ((bach benh) or (buou benh)) vi cua te*.