Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
luu tre » luu tru, cuu tre, luy tre
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
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: tu sach y ((mang may) or (lang xa)) hoi. hieu ve cam ((luc va) or (truc va)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((mang may) OR (lang xa)) hoi. hieu ve cam ((luc va) OR (truc va)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((mang may) or (lang xa)) hoi. hieu ve cam ((luc va) or (truc va)) hanh vi luu tre*.