Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
toc sach » hoc sach, doc sach, thuoc sach
danh dau » lanh dao, hang dau, danh tu
su triet » su viet, su tien, ve triet
va thai » van thai, va tai, va tham
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, tuc xa, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) danh dau ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoi. lieu va thai ((tuc va) OR (truc va)) danh dau ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) danh dau ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) danh dau ((cua triet) OR (su triet))*.