Perhaps you should try some spelling variations:
te sach » toc sach
thi van » thi lan, thi hanh, thi nang
nam soc » nam so, nam moc, nam son
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang
sach 2 » sach y
2 nang » v nang
x hoi » xa hoi, o hoi, x ho

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 2 nang x hoi. ((thien van) or (thi van)) nam soc ((va hang) OR (va nang)) dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang x hoi. ((thien van) OR (thi van)) nam soc ((va hang) OR (va nang)) dai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang x hoi. ((thien van) or (thi van)) nam soc ((va hang) OR (va nang)) dai cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang x hoi. ((thien van) or (thi van)) nam soc ((va hang) OR (va nang)) dai cua vat*.