Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
van chat » cao chat
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
vi va » vi van, vai va, bi va
vu va » vu van, tu va, su va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang ma hoi. hieu van chat luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ma hoi. hieu van chat luc ((va hanh) OR (ban hanh)) ((vi va) OR (vu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang ma hoi. hieu van chat luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ma hoi. hieu van chat luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet*.