Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
thu sach » tu sach, thuat sach, thuoc sach
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, dua tren
tuc va » thuc va, tuc xa, duc va
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: thu sach y nang ma hoi. hieu van cam ((tuc va) or (truc va)) thanh ve ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoi. hieu van cam ((tuc va) OR (truc va)) thanh ve ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ma hoi. hieu van cam ((tuc va) or (truc va)) thanh ve ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoi. hieu van cam ((tuc va) or (truc va)) thanh ve ((cua tre) OR (cua triet))*.