Perhaps you should try some spelling variations:
thien van » thi van
lam trung » lam truong, nam trung, lam trong
hieu van » lieu va, hieu ve
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
hieu va » lieu va, hieu qua
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 (hieu va))) or (thien van)) lam trung va 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 (hieu va))) OR (thien van)) lam trung va 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 (hieu va))) or (thien van)) lam trung va tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((((hieu van) OR (hieu va))) or (thien van)) lam trung va tinh vi cua tre*.