Perhaps you should try some spelling variations:
hoach dinh » hoang dinh
thuat sach » thuat lanh, thuat san
tinh thua » trinh thuc, ninh thuan, tinh phu
toan giao » ton giao, toan cao, hoa giao
tu hoach » thu hoach, tu hach, quy hoach
kinh suu » hinh su, dinh su, tinh su
dinh cu » dinh cuu, dinh chuc, dinh chau
so giao » so giai, hoc giao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hoach dinh cu - so giao ) or ( thuat sach ((kinh suu) or (tinh thua)) - toan giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hoach dinh cu - so giao ) OR ( thuat sach ((kinh suu) OR (tinh thua)) - toan giao )).
• Adding a wildcard symbol may retrieve word variants: (( tu hoach dinh cu - so giao ) or ( thuat sach ((kinh suu) or (tinh thua)) - toan giao ))*.