Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
sach han » sach tham, sach danh, sach nang
han lang » nhan lang, ban lang, ha lang
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
vi su » va su, ki su, oi su
ve su » va su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach han lang xa hoi. ((hieu va) OR (lieu va)) tai trung van hanh ((vi su) OR (ve su)) tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach han lang xa hoi. ((hieu va) or (lieu va)) tai trung van hanh ((vi su) OR (ve su)) tien~".
• Adding a wildcard symbol may retrieve word variants: su sach han lang xa hoi. ((hieu va) or (lieu va)) tai trung van hanh ((vi su) OR (ve su)) tien*.