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