Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
lang xa » lang ha, dang xay, lang van
luy tre » luyen tre
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
vi luy » vi lua, vi luu

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 tu ((lang xa) or (sang ma)) hoi. hieu ve cac ((ban va) or (tuc va)) hanh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((lang xa) OR (sang ma)) hoi. hieu ve cac ((ban va) OR (tuc va)) hanh vi luy tre.
• Adding a wildcard symbol may retrieve word variants: su sach tu ((lang xa) or (sang ma)) hoi. hieu ve cac ((ban va) or (tuc va)) hanh vi luy tre*.