Perhaps you should try some spelling variations:
sach tien » sach tren, sach thieu
tien nang » thien nang, trien nang, tin nang
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cua tre » cua te, dua tren, cua thep
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
nam xuc » cam xuc, nam xua, nam thuc
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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 tien nang ma hoi. hieu van nam xuc va tinh vi ((((cua tre) OR (cua triet))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tien nang ma hoi. hieu van nam xuc va tinh vi ((((cua tre) OR (cua triet))) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tien nang ma hoi. hieu van nam xuc va tinh vi ((((cua tre) OR (cua triet))) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach tien nang ma hoi. hieu van nam xuc va tinh vi ((((cua tre) OR (cua triet))) or (cuu tre))*.