Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
nam duc » nam duoc, pham duc, nam thuc
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang cao)) hoi. hieu van nam duc va thanh va ((cuu tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang cao)) hoi. hieu van nam duc va thanh va ((cuu tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang cao)) hoi. hieu van nam duc va thanh va ((cuu tre) or (su triet))*.