Perhaps you should try some spelling variations:
van thai » van thoai, van tai, van hai
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
cuu tre » cua tre, cau tren, cau treo
va thi » van thi, vu thi, ha thi
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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 thi) or (van thai)) tuc va dan vi ((cuu 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 thi) OR (van thai)) tuc va dan vi ((cuu tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. lieu ((va thi) or (van thai)) tuc va dan vi ((cuu tre) or (su triet))*.