Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang 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 ty ((lang xa) or (nang ma)) hoi. hieu ve cac ((ban va) or (tuc va)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (nang ma)) hoi. hieu ve cac ((ban va) OR (tuc va)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (nang ma)) hoi. hieu ve cac ((ban va) or (tuc va)) hanh vi luu tre*.