Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
ly quang » le quang, vu quang
te sach » toc sach
va danh » va dinh, va hanh, dia danh
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cua tre » cua te, cuu tre, cua triet
ly van » le van, ly va, ly von
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
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 ((ly quang) or (ly van)) x hoi. hieu va pham thuc ((va danh) OR (va dan)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly quang) OR (ly van)) x hoi. hieu va pham thuc ((va danh) OR (va dan)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly quang) or (ly van)) x hoi. hieu va pham thuc ((va danh) OR (va dan)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly quang) or (ly van)) x hoi. hieu va pham thuc ((va danh) OR (va dan)) vi cua tre*.