Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang o hai. hieu van chat duc va ((thanh dai) OR (thanh tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o hai. hieu van chat duc va ((thanh dai) OR (thanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hai. hieu van chat duc va ((thanh dai) OR (thanh tai)) cua triet*.