Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
vien cua » dien cua, tien cua, bien cua
su sach » so sach, vu sach
dang ha » dong ha, dung ha, tang ha
lang ha » long ha
duc ban » duc tan, duc van, dua ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu ((dang ha) or (lang ha)) noi. hieu van pham duc ban thanh ((vien cua) OR (viec cua)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((dang ha) OR (lang ha)) noi. hieu van pham duc ban thanh ((vien cua) OR (viec cua)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((dang ha) or (lang ha)) noi. hieu van pham duc ban thanh ((vien cua) OR (viec cua)) cu".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((dang ha) or (lang ha)) noi. hieu van pham duc ban thanh ((vien cua) OR (viec cua)) cu*.