Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hanh tinh » hanh trinh, thanh tinh, canh tinh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
sach ly » sach y, sach lo, sach ty
van cau » van dau, van hau, van chat
ly hang » ly quang
cuu tre » cua tre, cau tren, cau treo
hang o » hang do, hang o2, hoang o
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly hang o hoi. hieu van cau ((luc van) or (duc van)) ((hanh tinh) OR (nhanh tinh)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly hang o hoi. hieu van cau ((luc van) OR (duc van)) ((hanh tinh) OR (nhanh tinh)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly hang o hoi. hieu van cau ((luc van) or (duc van)) ((hanh tinh) OR (nhanh tinh)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly hang o hoi. hieu van cau ((luc van) or (duc van)) ((hanh tinh) OR (nhanh tinh)) cuu tre*.