Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
tinh lam » trinh lam, dinh lam, tinh lao
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
cua tre » cuu tre, dua tren, cua thep
cua te » cua tu

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