Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va thai » van thai, va tai, va tham
van tai » von tai, van tuan
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va don » va dong, va doc, va do

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. lieu ((va thai) or (van tai)) tuc va don vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. lieu ((va thai) OR (van tai)) tuc va don vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. lieu ((va thai) or (van tai)) tuc va don vi ((cua tre) or (su triet))*.