Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
truoc va » truc va, thuoc va, truong va
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet
ve lam » va lam, de lam, se lam
sach v » sach va, sach 2, sach vay

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 v) OR (sach y)) nang cao hoi. hieu ve lam truoc va ((hanh tai) or (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach v) OR (sach y)) nang cao hoi. hieu ve lam truoc va ((hanh tai) OR (hang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach v) OR (sach y)) nang cao hoi. hieu ve lam truoc va ((hanh tai) or (hang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach v) OR (sach y)) nang cao hoi. hieu ve lam truoc va ((hanh tai) or (hang tai)) cua tre*.