Perhaps you should try some spelling variations:
hang dien » quang dien, dang dieu, nhan dien
dien cua » dieu cua, dien cuc, dien cu
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
ho nang » thi nang, kha nang, cao nang
lo nang » ly nang, loai nang, cao nang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((lo nang) OR (ho nang)) xa hoi. hieu ve cam ((duc va) or (thuc vat)) hang dien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((lo nang) OR (ho nang)) xa hoi. hieu ve cam ((duc va) OR (thuc vat)) hang dien cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((lo nang) OR (ho nang)) xa hoi. hieu ve cam ((duc va) or (thuc vat)) hang dien cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((lo nang) OR (ho nang)) xa hoi. hieu ve cam ((duc va) or (thuc vat)) hang dien cua tre*.