Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sanh ky » hanh ky, nganh ky, thanh ky
sang ky » sang kyo, dang ky, tang ky
cao hoi » cau hoi, co hoi, cao hoc
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cac » xuc tac, tuc cac, xuc cam
dan va » doan va, ban va, han va
cua tu » cua tuc, cua su, cua cu

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 ky) OR (sang ky)) nang cao hoi. hieu van cac xuc cac ((dan va) or (dan ca)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sanh ky) OR (sang ky)) nang cao hoi. hieu van cac xuc cac ((dan va) OR (dan ca)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sanh ky) OR (sang ky)) nang cao hoi. hieu van cac xuc cac ((dan va) or (dan ca)) cua tu".
• Adding a wildcard symbol may retrieve word variants: so ((sanh ky) OR (sang ky)) nang cao hoi. hieu van cac xuc cac ((dan va) or (dan ca)) cua tu*.