Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
sach tu » sach thu, cach tu, sach ty
va danh » va dinh, va dan, va hanh
cam tao » cau tao, cai tao, cam tay
hieu va » lieu va, hieu qua
tu nang » tru nang, tu nong, tu nano
x hoi » xa hoi, o hoi, x ho

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 tu nang x hoi. ((hieu van) OR (hieu va)) cam tao va danh ((vi luu) or (vi lua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu nang x hoi. ((hieu van) OR (hieu va)) cam tao va danh ((vi luu) OR (vi lua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu nang x hoi. ((hieu van) OR (hieu va)) cam tao va danh ((vi luu) or (vi lua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach tu nang x hoi. ((hieu van) OR (hieu va)) cam tao va danh ((vi luu) or (vi lua)) tre*.