Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
so sanh » do sanh
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
lai cua » hai cua, lai chau, thai cua
sanh y » sinh y, anh y, hanh y
y tang » ky tang, 6 tang, 7 tang
ve cam » ve cham, ve cac, va cam
cam tu » cam thu, nam tu, dam tu
tu van » tu va

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 y tang xa hoi. hieu ve cam tu van hanh ((lai cua) or (dai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y tang xa hoi. hieu ve cam tu van hanh ((lai cua) OR (dai cua)) viet*.