Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, ca tren, cau treo
thanh da » thanh dat, thanh dam, thanh dan
van cham » van chat, van tham, va cham
sang ma » tang ma, sang tao, mang may
sanh ty » sach ty, canh tay
soc gia » toc gia, hoc gia, so gia
nang ma » tang ma, nang cao, mang may
so sanh » do sanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ty ((nang ma) OR (sang ma)) hoi. hieu van cham soc gia thanh da ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty ((nang ma) OR (sang ma)) hoi. hieu van cham soc gia thanh da ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty ((nang ma) OR (sang ma)) hoi. hieu van cham soc gia thanh da ((cau tren) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: so sanh ty ((nang ma) OR (sang ma)) hoi. hieu van cham soc gia thanh da ((cau tren) or (dau tren))*.