Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
su viet » so viet
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: thu sach v nang xa hoi. ((hieu van) or (hieu va)) cam xuc ((van hanh) OR (ban hanh)) va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang xa hoi. ((hieu van) OR (hieu va)) cam xuc ((van hanh) OR (ban hanh)) va su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang xa hoi. ((hieu van) or (hieu va)) cam xuc ((van hanh) OR (ban hanh)) va su viet".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang xa hoi. ((hieu van) or (hieu va)) cam xuc ((van hanh) OR (ban hanh)) va su viet*.