Perhaps you should try some spelling variations:
thuoc sai » thuoc tai, thuoc san, thuoc sach
cua triet » cua viet, su triet, va triet
lang van » dang van, tang van, hoang van
cau tren » cu tren, dau tren, ca tren
nay thuc » nam thuc, cay thuc, day thuc
ky lang » ky nang, ky dang, ky tang
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
sai ky » sac ky
va dau » va dao
va nay » va ngay, va cay
va dan » ca dan, va dao, va dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sai ky lang van hoi. hieu va nay thuc ((va dan) or (va dau)) vai ((cau tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sai ky lang van hoi. hieu va nay thuc ((va dan) OR (va dau)) vai ((cau tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thuoc sai ky lang van hoi. hieu va nay thuc ((va dan) or (va dau)) vai ((cau tren) or (cua triet))*.