Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
duc manh » suc manh, duc anh, duc minh
luoc can » luc canh, hoc can, luoc dai
vien cac » vien bach, vien dai, vien da
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky ((nang xa) or (nang ma)) hoi. hieu vien cac ((duc manh) or (luoc can)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky ((nang xa) OR (nang ma)) hoi. hieu vien cac ((duc manh) OR (luoc can)) hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: te san ky ((nang xa) or (nang ma)) hoi. hieu vien cac ((duc manh) or (luoc can)) hanh vi cua vat*.