Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cay phoi » cap phoi, tay hoi, cay cho
vien cac » vien bach, vien dai, vien da
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
may va » may vi, day va
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de cua
tu san » thu san, tu ban, tu can
ke va » te va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ((ke va) or (may va)) cay phoi. hieu vien cac xuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ke va) OR (may va)) cay phoi. hieu vien cac xuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ((ke va) or (may va)) cay phoi. hieu vien cac xuc va hanh di cua tre*.