Perhaps you should try some spelling variations:
tan khang » van khang, tao khang, tinh khang
cac khoi » cac thoi, cac khoan, cach thoi
khang va » hang va, thang va, khang a
dai khoa » da khoa, tai khoa, dac khoa
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) lang ((dai khoa) or (cac khoi)). hieu ve cam duc tan khang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) lang ((dai khoa) OR (cac khoi)). hieu ve cam duc tan khang va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) lang ((dai khoa) or (cac khoi)). hieu ve cam duc tan khang va cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) lang ((dai khoa) or (cac khoi)). hieu ve cam duc tan khang va cua tre*.