Perhaps you should try some spelling variations:
trung may » trung ma, trung tam, trung cap
thien van » thi van
trung gay » trong gay, trung tam, trung cap
hieu van » hieu va, lieu va, hieu ve
tinh vi » trinh vi, tinh voi, tinh va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di 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 y nang xa hoi. ((hieu van) or (thien van)) lam ((trung may) OR (trung gay)) tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu van) OR (thien van)) lam ((trung may) OR (trung gay)) tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu van) or (thien van)) lam ((trung may) OR (trung gay)) tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu van) or (thien van)) lam ((trung may) OR (trung gay)) tinh vi cua tre*.