Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang van » hoang van, hang va
su triet » su viet, su tien, ve triet
dang xay » van xay
nam sua » nam cua, nam suu, nam mua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
thi van » thi lan, thi hanh, thi nang
sach o » sach lo, sac o, sach y
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 o ((dang xay) or (dang van)) hoi. thi van nam sua ((va danh) OR (va hanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o ((dang xay) OR (dang van)) hoi. thi van nam sua ((va danh) OR (va hanh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach o ((dang xay) or (dang van)) hoi. thi van nam sua ((va danh) OR (va hanh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach o ((dang xay) or (dang van)) hoi. thi van nam sua ((va danh) OR (va hanh)) vi su triet*.