Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va danh, ban hanh
su tien » su kien, su hien, tu tieng
cam tu » cam thu, nam tu, dam tu
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thue nang x ho. ((hieu van) OR (thien van)) cam tu ((va thanh) or (va hanh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thue nang x ho. ((hieu van) OR (thien van)) cam tu ((va thanh) OR (va hanh)) ki su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thue nang x ho. ((hieu van) OR (thien van)) cam tu ((va thanh) or (va hanh)) ki su tien".
• Adding a wildcard symbol may retrieve word variants: vu sach thue nang x ho. ((hieu van) OR (thien van)) cam tu ((va thanh) or (va hanh)) ki su tien*.