Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
cam truc » lam truoc, nam truoc, am thuc
nam truc » nam truoc, nam thuc, nam trung
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu van ((((cam truc) OR (cau truc))) or (nam truc)) va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu van ((((cam truc) OR (cau truc))) OR (nam truc)) va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu van ((((cam truc) OR (cau truc))) or (nam truc)) va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu van ((((cam truc) OR (cau truc))) or (nam truc)) va hanh dai cua triet*.