Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
nam luc » nang luc, nhan luc, nam thuc
va tinh » may tinh
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
va cua » via cua, ca cua, da cua
ma cua » ca cua, manh cua, mang 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 nam luc va tinh ((((va cua) OR (ma cua))) or (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van nam luc va tinh ((((va cua) OR (ma cua))) OR (va chua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu van nam luc va tinh ((((va cua) OR (ma cua))) or (va chua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van nam luc va tinh ((((va cua) OR (ma cua))) or (va chua)) tre*.