Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
thuc van » thuc vat, thuc dan, thuc va
hanh ve » hanh vi, hanh va, hanh kem
luc van » luoc van, luu van, duc van
thu sac » thu sach, thu san, thu xac
long ha » dong ha, cong ha, dong hoa
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang xa) or (long ha)) hoi. hieu vien cac ((thuc van) or (luc van)) hanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (long ha)) hoi. hieu vien cac ((thuc van) OR (luc van)) hanh ve cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (long ha)) hoi. hieu vien cac ((thuc van) or (luc van)) hanh ve cuu tre*.