Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu su » hieu sau, tieu su, hieu so
su kham » su pham, vu kham, so kham
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. hieu su kham ((tuc xa) or (thuc va)) doan va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu su kham ((tuc xa) OR (thuc va)) doan va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu su kham ((tuc xa) or (thuc va)) doan va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu su kham ((tuc xa) or (thuc va)) doan va ((cua tre) OR (cua triet))*.