Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
luu tre » luu tru, cuu tre, luy tre
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
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 ((ly nang) or (ly vang)) ma hoi. hieu ve cac ((duc va) or (thuc vat)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly vang)) ma hoi. hieu ve cac ((duc va) OR (thuc vat)) hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ly vang)) ma hoi. hieu ve cac ((duc va) or (thuc vat)) hanh vi luu tre*.