Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca cau
y lang » o lang, _ lang, tay lang
cac tu » cac thu, cach tu, cac du
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y lang xa hoi. hieu qua cac tu va dan can cau tren~.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y lang xa hoi. hieu qua cac tu va dan can cau tren*.