Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
luu tre » luu tru, cuu tre, luy tre
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac ((tuc va) or (thuc vat)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac ((tuc va) OR (thuc vat)) hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac ((tuc va) or (thuc vat)) hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cac ((tuc va) or (thuc vat)) hanh vi luu tre*.