Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
lam duc » lam duoc, pham duc, lam dung
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sanh » do sanh
ve cua » le cua, de cua, te cua

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