Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang hung
cac thuc » cach thuc, cac thu, can thuc
dan hanh » dan khanh, dan thanh, ban hanh
dang van » hoang van, hang va
cua viet » ca viet, hoa viet, cua vat
so sinh » so sanh, so tinh, cho sinh
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
sinh y » sinh ly
y tang » ky tang, 6 tang, 7 tang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sinh y tang xa hoi. hieu ve cac thuc ((dan hanh) or (((dang hanh) OR (dang van)))) tri cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sinh y tang xa hoi. hieu ve cac thuc ((dan hanh) OR (((dang hanh) OR (dang van)))) tri cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sinh y tang xa hoi. hieu ve cac thuc ((dan hanh) or (((dang hanh) OR (dang van)))) tri cua viet*".