Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
dang xay » dang van, van xay
thi hanh » thi thanh
su triet » su viet, su tien, ve triet
xay hoi » xa hoi, tay hoi, cay phoi
nam sua » nam cua, nam suu, nam mua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
thi van » thi lan, thi nang
o dang » xo dang, do dang, so dang
sua va » suat va, vua va, xua va
vi su » va su, ve su, ki su

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) OR (thuat sach)) o dang xay hoi. ((thi van) or (thi hanh)) nam sua va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) o dang xay hoi. ((thi van) OR (thi hanh)) nam sua va danh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) o dang xay hoi. ((thi van) or (thi hanh)) nam sua va danh vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) o dang xay hoi. ((thi van) or (thi hanh)) nam sua va danh vi su triet*.