Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
kham chua » kham pha
bang tay » ban tay, bang may, mang tay
so sach » so sanh, bo sach, co sach
gia cua » gian cua, giau cua, gia cuc
dan gia » dan gian, danh gia, dan giai
hieu ve » hieu va, hieu van
bang ma » bang may, tang ma, ban ma
va dan » ca dan, va dao, va dau
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thien ((bang ma) or (bang tay)) hoi. hieu ve ((kham chua) or (pham duc)) va dan gia cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thien ((bang ma) OR (bang tay)) hoi. hieu ve ((kham chua) OR (pham duc)) va dan gia cua te.
• Adding a wildcard symbol may retrieve word variants: so sach thien ((bang ma) or (bang tay)) hoi. hieu ve ((kham chua) or (pham duc)) va dan gia cua te*.