Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam duoc » nam duoc, luat duoc, lam thuoc
toc sach » hoc sach, doc sach, thuoc sach
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, dua tren
va danh » va dinh, va dan, va hanh
duoc va » nuoc va, duc va, duoc ma
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van lam » van nam

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) or (toc sach)) ky lang xa hoi. hieu van lam duoc va danh vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang xa hoi. hieu van lam duoc va danh vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky lang xa hoi. hieu van lam duoc va danh vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang xa hoi. hieu van lam duoc va danh vai ((cua tre) OR (cua triet))*.